Equivalent in combining or displacing power to two atoms of hydrogen; dyad.

Having two shells or valves which open and shut, as the oyster and certain seed vessels.

Having two valves, as the oyster and some seed pods; bivalve.

Bivalvular.

Having two valves.

Having two vaults or arches.

A term made up of the two parts / + /1 /-1, where / and /1 are vectors.

Having two bellies or protuberances; as, a biventral, or digastric, muscle, or the biventral lobe of the cerebellum.

Of or relating to the bivium.

Having, or leading, two ways.

One side of an echinoderm, including a pair of ambulacra, in distinction from the opposite side (trivium), which includes three ambulacra.

To watch at night or be on guard, as a whole army. To encamp for the night without tents or covering.

Occurring or appearing once every two weeks; fortnightly. A publication issued every two weeks.

To bewray; to reveal.

Odd in manner or appearance; fantastic; whimsical; extravagant; grotesque.

a dry cold north wind in southeastern France.

The upper faceted portion of a brilliant-cut diamond, which projects from the setting and occupies the zone between the girdle and the table. See Brilliant, n.

relating to or concerned with the combined affairs of two administrative zones.

the chemical symbol for berkelium.

One who blabs; a babbler; a telltale.

one who blabr; a tattler; a telltale.

someone who gossips indiscreetly.

tending to talk excessively.

same as blabbermouthed 1.

a genus of insects consisting of giant cockroaches.

That which is destitute of light or whiteness; the darkest color, or rather a destitution of all color; as, a cloth has a good black.

the dark color of a bruise in the flesh, which is accompanied with a mixture of blue.

depicted only in black and white colors, or in shades of gray; also called monochromatic and monochrome; -- of images. Opposite of color or in color, and contrasting with polychrome technicolor three-color; as, a black-and-white TV; black-and-white film; the movie /Schindler's List/ was shot in black and white.

a comedy that treats of morbid, tragic, gloomy, or grotesque situations as a major element of the plot.

any electronic instrument or part of an instrument whose function is defined, but which is treated as a unit without consideration of the internal mechanisms; broadly, any device whose internal workings are considered as incomprehensible or mysterious by the user; as, to treat the meter as a black box and take its readings on faith.

a comedy that treats of morbid, tragic, gloomy, or grotesque situations as a major element of the plot.

the popular name for a form of the chronic lung disease pneumoconiosis which is observed among coal miners, and is caused by the inhalation of coal dust. It is thus named because of the black appearance of the lungs (pneumomelanosis) of those affected with the disease. See also the related condition anthracosis.

the illicit buying and selling of goods, in violation of price controls, rationing, tax laws, prohibition of sale, etc.

to cause to become black, such as a stage, a computer screen, or a city.

Dark-visaged; swart.

discolored by or as if by bruising; -- of skin.

Having black eyebrows. Hence: Gloomy; dismal; threatening; forbidding.

Having black eyes.

Having a black, dark, or gloomy face or aspect.

a weasellike mammal (Mustela nigripes) inhabiting the western North American prairie, having dark feet, a dark-tipped tail, and a dark face on a yellowish-brown coat. It is an endangered species.

having black head hair; -- of people.

Having a wicked, malignant disposition; morally bad.

A name given by English miners to sphalerite, or zinc blende; -- called also false galena. See Blende.

To coat or to polish with black lead (graphite).

Written or printed in black letter; as, a black-letter manuscript or book.

distributed or sold illicitly.

Using foul or scurrilous language; slanderous.

requiring semiformal evening clothes, e. g. a black bowtie and a tuxedo or dinner jacket for men, and a formal dress for women; contrasted with white-tie, for a fully formal occasion, and with informal, and casual.

A negro or negress.

To vote against, by putting a black ball into a ballot box; to reject or exclude, as by voting against with black balls; to ostracize.

An earthy carbonate of iron containing considerable carbonaceous matter; -- valuable as an iron ore.

The fruit of several species of bramble (Rubus); also, the plant itself. Rubus fruticosus is the blackberry of England; Rubus villosus and Rubus Canadensis are the high blackberry and low blackberry of the United States. There are also other kinds.

garden plant whose capsule discloses when ripe a mass of seeds resembling a blackberry.

to engage in the slave trade.

A slave ship; a slaver.

The kidnaping of negroes or Polynesians to be sold as slaves.

A broad board painted black, or any black surface on which writing, drawing, or the working of mathematical problems can be done with chalk or crayons. It is much used in schools. In late 20th century similar boards of a green slate as well as some colored white became common; wrioting on the slate bioards may be done with chalk, but writing on the white boards is done with colored pens, such as grease pens, which leaves a trace that can be easily erased. The newer boards, usualy called chalkboards are nevertheless still sometimes referred to as blackboards.

A small European song bird (Sylvia atricapilla), with a black crown; the mock nightingale. An American titmouse (Parus atricapillus); the chickadee. Also called the black-cap chickadee.

A clergyman; -- familiarly so called, as a soldier is sometimes called a redcoat or a bluecoat.

The male of the European black grouse (Tetrao tetrix, Linn.); -- so called by sportsmen. The female is called gray hen. See Heath grouse.

One who blackens.

A tribe of North American Indians formerly inhabiting the country from the upper Missouri River to the Saskatchewan, but now much reduced in numbers.

See Bluefin.

A small kind of whale, of the genus Globicephalus, of several species. The most common is Globicephalus melas. Also sometimes applied to other whales of larger size.

Of or pertaining to the Blackfeet; as, a Blackfoot Indian. A Blackfoot Indian.

Scurrilous; abusive; low; worthless; vicious; as, blackguard language.

The conduct or language of a blackguard; ruffianism.

In the manner of or resembling a blackguard; abusive; scurrilous; ruffianly.

The scaup duck.

A heart-shaped cherry with a very dark-colored skin.

Any preparation for making things black; esp. one for giving a black luster to boots and shoes, or to stoves.

Somewhat black.

A notorious gambler.

To put in a black list as deserving of suspicion, censure, or punishment; esp. to put in a list of persons stigmatized as insolvent or untrustworthy, -- as tradesmen and employers do for mutual protection; as, to blacklist a workman who has been discharged. See Black list, under Black, a.

In a black manner; darkly, in color; gloomily; threateningly; atrociously.

To extort money from by exciting fears of injury other than bodily harm, as injury to reputation, distress of mind, etc.; as, to blackmail a merchant by threatening to expose an alleged fraud.

One who extorts, or endeavors to extort, money, by black mailing.

The act or practice of extorting money by exciting fears of injury other than bodily harm, as injury to reputation.

See Blackamoor.

The quality or state of being black; black color; atrociousness or enormity in wickedness.

a suspension of radio or tv broadcasting.

A warbler of the United States (Dendroica striata).

See Colicroot.

The name of a kind of in used in copperplate printing, prepared from the charred husks of the grape, and residue of the wine press.

One who makes crude potash, or black salts.

A smith who works in iron with a forge, and makes iron utensils, horseshoes, etc.

A snake of a black color, of which two species are common in the United States, the Bascanium constrictor, or racer, sometimes six feet long, and the Scotophis Alleghaniensis, seven or eight feet long.

A mixture of spirituous liquor (usually rum) and molasses.

A fish; the ruff or pope.

A spreading thorny shrub or small tree (Prunus spinosa), with blackish bark, and bearing little black plums, which are called sloes; the sloe. A species of Crat/gus or hawthorn (Crat/gus tomentosa). Both are used for hedges.

a bituminous material used for providing a smooth paving to a road.

paved with a bituminous material; -- of roads or paths; as, a blacktopped driveway.

same as defame.

A lotion made by mixing calomel and lime water.

any of several human or animal diseases characterized by dark urine resulting from rapid breakdown of red blood cells; -- used especially of blackwater fever, a severe form of malaria caused by the blood parasite Plasmodium falciparum.

A name given to several dark-colored timbers. The East Indian black wood is from the tree Dalbergia latifolia.

Work wrought by blacksmiths; -- so called in distinction from that wrought by whitesmiths.

To swell out like a bladder with air; to inflate.

similar to a bladder.

a medium-sized blackish-gray seal (Cystophora cristata) with a large inflatable sac on the head; of Arctic-Atlantic waters.

a North American wild lobelia (Lobelia inflata) having small blue flowers and inflated capsules formerly used as an antispasmodic.

A genus (Utricularia) of aquatic or marshy plants, which usually bear numerous vesicles in the divisions of the leaves. These serve as traps for minute animals. See Ascidium.

similar to and found with black rockweed.

Having bladders; also, resembling a bladder.

To put forth or have a blade.

The scapula. See Blade, 4.

Having a blade or blades; as, a two-bladed knife.

A long, thin, marine fish of Europe (Trichiurus lepturus); the ribbon fish.

A sword cutler.

Consisting of blades.

Dark blue or bluish gray; lead-colored.

The bilberry.

Mendacious boasting; falsehood; humbug.

An inflammatory swelling or sore; a bulla, pustule, or blister.

Deserving of censure; faulty; culpable; reprehensible; censurable; blameworthy.

An expression of disapprobation fir something deemed to be wrong; imputation of fault; censure.

same as blameworthy.

Faulty; meriting blame.

Free from blame; without fault; innocent; guiltless; -- sometimes followed by of.

In a blameless manner.