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Pennyroyal

An aromatic herb (Mentha Pulegium) of Europe; also, a North American plant (Hedeoma pulegioides) resembling it in flavor.

Pennyweight

A troy weight containing twenty-four grains, or the twentieth part of a troy ounce; 1.555 grams; as, a pennyweight of gold or of arsenic. It is abbreviated dwt or pwt. It was anciently the weight of a silver penny, whence the name.

Pennywort

A European trailing herb (Linaria Cymbalaria) with roundish, reniform leaves. It is often cultivated in hanging baskets.

Pennyworth

A penny's worth; as much as may be bought for a penny.

Penologist

One versed in, or a student of, penology.

Penology

The science or art of punishment.

Pens

pl. of Penny; pence.

Pensile

Hanging; suspended; pendent; pendulous.

Pensileness

State or quality of being pensile; pendulousness.

Pension

To grant a pension to; to pay a regular stipend to; in consideration of service already performed; -- sometimes followed by off; as, to pension off a servant.

pensionable

Entitled to receive a pension; as, a pensionable employee.

Pensionary

One who receives a pension; a pensioner.

Pensioner

One in receipt of a pension; hence, figuratively, a dependent.

Pensive

Thoughtful, sober, or sad; employed in serious reflection; given to, or favorable to, earnest or melancholy musing.

Pensiveness

The state of being pensive; serious thoughtfulness; seriousness.

Penstemon

A large genus of subshrubs or herbs having showy blue or purple or red or yellow or white flowers; found mostly in Western North America.

Penstock

A close conduit or pipe for conducting water, as, to a water wheel, or for emptying a pond, or for domestic uses.

Pent

Penned or shut up; confined; -- often with up.

pent-

Same as penta-; -- used as a combining form before vowels, as in pentoxide.

Penta-

A combining form denoting five; as, pentacapsular; pentagon.

Pentabasic

Capable of uniting with five molecules of a monacid base; having five acid hydrogen atoms capable of substitution by a basic radical; -- said of certain acids.

Pentachenium

A dry fruit composed of five carpels, which are covered by an epigynous calyx and separate at maturity.

Pentachloride

A chloride having five atoms of chlorine in each molecule; as, phosphorus pentachloride.

Pentachord

An ancient instrument of music with five strings.

Pentacid

Capable of neutralizing, or combining with, five molecules of a monobasic acid; having five hydrogen atoms capable of substitution by acid residues; -- said of certain complex bases.

Pentacle

A five-pointed star, also called a pentagram or pentalpha. See illustr. under pentalpha. Sometimes referring to a similar figure, such as the figure composed of two equilateral triangles intersecting so as to form a six-pointed star. It was used in early ornamental art, and also with superstitious import by the astrologers and mystics of the Middle Ages. The six-pointed star is more comonly called a hexagram, or called Solomon's seal; it resembles the star of David (Magen David)

Pentacoccous

Composed of five united carpels with one seed in each, as certain fruits.

Pentacrinin

A red and purple pigment found in certain crinoids of the genus Pentacrinus.

Pentacrinoid

An immature comatula when it is still attached by a stem, and thus resembles a Pentacrinus.

Pentacrinus

A genus of large, stalked crinoids, of which several species occur in deep water among the West Indies and elsewhere.

Pentacron

A solid having five summits or angular points.

Pentacrostic

A set of verses so disposed that the name forming the subject of the acrostic occurs five times -- the whole set of verses being divided into five different parts from top to bottom.

Pentad

Having the valence of a pentad.

Pentadactyloid

Having the form of, or a structure modified from, a pentadactyl limb.

Pentadecane

A hydrocarbon of the paraffin series, (C15H32) found in petroleum, tar oil, etc., and obtained as a colorless liquid; -- so called from the fifteen carbon atoms in the molecule.

Pentadecatoic

Of, pertaining to, or derived from, pentadecane, or designating an acid related to it.

Pentadelphous

Having the stamens arranged in five clusters, those of each cluster having their filaments more or less united, as the flowers of the linden.

Pentafid

Divided or cleft into five parts.

Pentagon

A plane figure having five angles, and, consequently, five sides; any figure having five angles.

Pentagynia

A Linn/an order of plants, having five styles or pistils.

Pentahedral

Having five sides; as, a pentahedral figure.

Pentail

A peculiar insectivore (Ptilocercus Lowii) of Borneo; -- so called from its very long, quill-shaped tail, which is scaly at the base and plumose at the tip.

Pentalpha

A five-pointed star, resembling five alphas joined at their bases; -- used as a symbol.

Pentamera

An extensive division of Coleoptera, including those that normally have five-jointed tarsi. It embraces about half of all the known species of the Coleoptera.

Pentamerous

Divided into, or consisting of, five parts; also, arranged in sets, with five parts in each set, as a flower with five sepals, five petals, five, or twice five, stamens, and five pistils.

Pentamerus

A genus of extinct Paleozoic brachiopods, often very abundant in the Upper Silurian.

Pentamethylene

A hypothetical hydrocarbon, C5H10, metameric with the amylenes, and the nucleus of a large number of derivatives; -- so named because regarded as composed of five methylene residues. Cf. Trimethylene, and Tetramethylene.

Pentandria

A Linn/an class of plants having five separate stamens.

Pentane

Any one of the three metameric hydrocarbons, C5H12, of the methane or paraffin series. They are colorless, volatile liquids, two of which occur in petroleum. So called because of the five carbon atoms in the molecule.

Pentapody

A measure or series consisting of five feet.

Pentaptych

A picture, or combination of pictures, consisting of a centerpiece and double folding doors or wings, as for an altarpiece.

Pentarchy

A government in the hands of five persons; five joint rulers.

Pentastich

A composition consisting of five verses.

Pentastichous

Having, or arranged in, five vertical ranks, as the leaves of an apple tree or a cherry tree.

Pentastyle

Having five columns in front; -- said of a temple or portico in classical architecture. A portico having five columns.

Pentateuch

The first five books of the Old Testament, collectively; -- called also the Law of Moses, Book of the Law of Moses, etc.

Pentathionic

Pertaining to, or designating, an acid of sulphur obtained by leading hydrogen sulphide into a solution of sulphur dioxide; -- so called because it contains five atoms of sulphur.

Pentathlon

A fivefold athletic performance peculiar to the great national games of the Greeks, including leaping, foot racing, wrestling, throwing the discus, and throwing the spear.

Pentatomic

Having five atoms in the molecule. Having five hydrogen atoms capable of substitution.

Pentavalent

Having a valence of five; -- said of certain atoms and radicals.

Pentecost

A solemn festival of the Jews; -- so called because celebrated on the fiftieth day (seven weeks) after the second day of the Passover (which fell on the sixteenth of the Jewish month Nisan); -- hence called, also, the Feast of Weeks. At this festival an offering of the first fruits of the harvest was made. By the Jews it was generally regarded as commemorative of the gift of the law on the fiftieth day after the departure from Egypt.

Pentecostal

Of or pertaining to Pentecost or to Whitsuntide.

Pentecostals

Offerings formerly made to the parish priest, or to the mother church, at Pentecost.

Pentecoster

An officer in the Spartan army commanding fifty men.

Pentecosty

A troop of fifty soldiers in the Spartan army; -- called also pentecostys.

Pentelican Pentelic

Of or pertaining to Mount Pentelicus, near Athens, famous for its fine white marble quarries; obtained from Mount Pentelicus; as, the Pentelic marble of which the Parthenon is built.

Pentine

An unsaturated hydrocarbon, C5H8, of the acetylene series. Same as Valerylene.

Pentoic

Pertaining to, or desingating, an acid (called also valeric acid) derived from pentane.

Pentose

Any of a group of sugars of the formula C5H10O5, such as as arabinose or ribose; -- so called from the five carbon atoms in the molecule. They are not fermented by yeast.

Pentoxide

An oxide containing five atoms of oxygen in each molecule; as, phosphorus pentoxide, P2O5.

Pentremites

A genus of crinoids belonging to the Blastoidea. They have five petal-like ambulacra.

Pentyl

The hypothetical radical, C5H11, of pentane and certain of its derivatives. Same as Amyl.

Pentylic

Pertaining to, derived from, or containing, pentyl; as, pentylic alcohol

Penult

The last syllable but one of a word; the syllable preceding the final one.

Penumbra

An incomplete or partial shadow.

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