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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.

Penurious

Excessively sparing in the use of money; sordid; stingy; miserly.

Penury

Absence of resources; want; privation; indigence; extreme poverty; destitution.

Penwiper

A cloth, or other material, for wiping off or cleaning ink from a pen.

Peon

A foot soldier; a policeman; also, an office attendant; a messenger.

Peony

A plant, and its flower, of the ranunculaceous genus P/onia. Of the four or five species, one is a shrub; the rest are perennial herbs with showy flowers, often double in cultivation.

People

To stock with people or inhabitants; to fill as with people; to populate.

Peopled

Stocked with, or as with, people; inhabited.

Peorias

An Algonquin tribe of Indians who formerly inhabited a part of Illinois.

Peperino Peperine

A volcanic rock, formed by the cementing together of sand, scoria, cinders, etc.

Peplis

A genus of plants including water purslane.

Peplum

A peplos. Hence: An overskirt hanging like an ancient peplos; also, a short fitted skirt attached to a waist or coat.

Peplus

An upper garment worn by Grecian and Roman women.

Pepo

Any fleshy fruit with a firm rind, as a pumpkin, melon, or gourd. See Gourd.

Pepper

To fire numerous shots (at).

Pepper box

A buttress on the left-hand wall of a fives court as the game is played at Eton College, England.

Peppercorn

A dried berry of the black pepper (Piper nigrum).

Pepperer

A grocer; -- formerly so called because he sold pepper.

Peppergrass

Any herb of the cruciferous genus Lepidium, especially the garden peppergrass, or garden cress, Lepidium sativum; -- called also pepperwort. All the species have a pungent flavor. The common pillwort of Europe (Pilularia globulifera). See Pillwort.

Pepperidge

A North American tree (Nyssa multiflora) with very tough wood, handsome oval polished leaves, and very acid berries, -- the sour gum, or common tupelo. See Tupelo.

Peppermint

An aromatic and pungent plant of the genus Mentha (Mentha piperita), much used in medicine and confectionery.

Pepperoni

a hard sausage of beef and pork, highly seasoned.

peppershaker

A shaker with a perforated top for sprinkling ground pepper.

pepperwood

A Pacific coast tree (Umbellularia californica) having aromatic foliage and small umbellate flowers followed by olivelike fruit; yields a hard tough wood.

Peppery

Of or pertaining to pepper; having the qualities of pepper; hot; pungent.

peppy

Full of pep; spirited; bouncy{2}; as, the peppy and interesting talk.

Pepsi

Pepsi Cola; -- a familiar contraction; as, I prefer Pepsi to Coke.

Pepsi-Cola Pepsi Cola

A carbonated soft drink flavored by extract from the cola nut (kola nut). The nut is found on trees of the species Cola acuminata and Cola nitida.

Pepsin

A proteolytic enzyme (MW 34,500) contained in the secretory glands of the stomach. In the gastric juice it is united with dilute hydrochloric acid (0.2 per cent, approximately) and the two together constitute the active portion of the digestive fluid. It degrades proteins to proteoses and peptides, and is notable for having a very low pH optimum for its activity. It is the active agent in the gastric juice of all animals.

Pepsinogen

A proenzyme, the antecedent of the enzyme pepsin. A substance contained in the form of granules in the peptic cells of the gastric glands. It is readily convertible into pepsin. Also called propepsin.

Peptic

An agent that promotes digestion.

Peptogen

A substance convertible into peptone.

Peptogenous

Capable of yielding, or being converted into, peptone.

Peptohydrochloric

Designating a hypothetical acid (called peptohydrochloric acid, pepsinhydrochloric acid, and chloropeptic acid) which is supposed to be formed when pepsin and dilute (0.1-0.4 per cent) hydrochloric acid are mixed together.

Peptone

The soluble polypeptides produced by hydrolysis of protein; specifically the soluble peptides into which food is transformed by the action of the gastric and pancreatic juices. Peptones are also formed from protein matter by the action of boiling water and boiling dilute acids. Collectively, in a broader sense, all the products resulting from the solution of proteinaceous matter in either gastric or pancreatic juice. In this case, however, intermediate products (albumose bodies), such as antialbumose, hemialbumose, etc., are mixed with the true peptones. Also termed albuminose.

Peptonize

To convert into peptone; to digest or dissolve by means of a proteolytic ferment; as, peptonized food.

Peptonuria

The presence of peptone, or a peptonelike body, in the urine; now referred to as proteinuria.

Peptotoxine

A toxic alkaloid found occasionally associated with the peptones formed from fibrin by pepsinhydrochloric acid.

Pequots

A tribe of Indians who formerly inhabited Eastern Connecticut.

Per

Through; by means of; through the agency of; by; for; for each; as, per annum; per capita, by heads, or according to individuals; per curiam, by the court; per se, by itself, of itself. Per is also sometimes used with English words.

Peract

To go through with; to perform.

Peracute

Very sharp; very violent; as, a peracute fever.

Peradventure

Chance; hap; hence, doubt; question; as, proved beyond peradventure.

Peraeopod

One of the thoracic legs of a crustacean. See Illust. of Crustacea.

Peragration

The act or state of passing through any space; as, the peragration of the moon in her monthly revolution.

Perambulate

To walk about; to ramble; to stroll; as, he perambulated in the park.

perambulating

Strolling or walking around; as, in the field we met some perambulating veterans.

Perameles

Any marsupial of the genus Perameles, which includes numerous species found in Australia. They somewhat resemble rabbits in size and form. See Illust. under Bandicoot.

Perbromic

Pertaining to, or designating, the highest oxygen acid, HBrO4, of bromine.

Perbromide

A bromide having a higher proportion of bromine than any other bromide of the same substance or series.

Perca

A genus of fishes, including the fresh-water perch.

Percale

A fine cotton fabric, having a linen finish, and often printed on one side, -- used for women's and children's wear, and for bedsheets.

Percaline

A fine kind of cotton goods, usually of one color, and with a glossy surface, -- much use for linings.

Percarbide

A compound containing a relatively large amount of carbon.

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