Pentacid Pen·tac"id adjective [
Pent a- +
acid .]
(Chemistry) 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 Pen"ta·cle noun [ Greek ... five.]
A figure composed of two equilateral triangles intersecting so as to form a six-pointed star, -- used in early ornamental art, and also with superstitious import by the astrologers and mystics of the Middle Ages.
Pentacoccous Pen`ta·coc"cous adjective [ See
Penta- ,
Coccus .]
(Botany) Composed of five united carpels with one seed in each, as certain fruits.
Pentaconter Pen"ta·con`ter noun (Gr. Antiq.) See Penteconter .
Pentacrinin Pen·tac"ri·nin noun (Physiol. Chem.) A red and purple pigment found in certain crinoids of the genus Pentacrinus.
Pentacrinite Pen·tac"ri·nite noun [
Penta- + Greek ... a lily.]
(Zoology) Any species of Pentacrinus.
Pentacrinoid Pen·tac"ri·noid noun [
Pentacrinus +
-oid .]
(Zoology) An immature comatula when it is still attached by a stem, and thus resembles a Pentacrinus.
Pentacrinus Pen·tac"ri·nus noun [ New Latin See
Penta- , and
Crinum .]
(Zoology) A genus of large, stalked crinoids, of which several species occur in deep water among the West Indies and elsewhere.
Pentacron Pen·ta"cron noun ;
plural Latin
Pentacra , English
Pentacrons . [ New Latin , from Greek ... five + ... a summit.]
(Geom.) A solid having five summits or angular points.
Pentacrostic Pen`ta·cros"tic noun [
Penta- +
acrostic .]
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 Pen"tad noun [ Greek ..., ..., a body of five, from ... five.]
(Chemistry) Any element, atom, or radical, having a valence of five, or which can be combined with, substituted for, or compared with, five atoms of hydrogen or other monad; as, nitrogen is a pentad in the ammonium compounds.
Pentad Pen"tad adjective (Chemistry) Having the valence of a pentad.
Pentadactyl, Pentadactyle Pen`ta·dac"tyl, Pen`ta·dac"tyle adjective [ Greek ... with five fingers or toes. See
Penta- , and
Dactyl .]
1. (Anat.) Having five digits to the hand or foot. 2. Having five appendages resembling fingers or toes.
Pentadactyloid Pen`ta·dac"tyl·oid adjective [
Pentadactyl +
-oid .]
(Anat.) Having the form of, or a structure modified from, a pentadactyl limb.
Pentadecane Pen`ta·dec"ane noun [
Penta- + Greek ... ten.]
(Chemistry) A hydrocarbon of the paraffin series, (C 15 H 32 ) found in petroleum, tar oil, etc., and obtained as a colorless liquid; -- so called from the fifteen carbon atoms in the molecule.
Pentadecatoic Pen`ta·dec`a·to"ic adjective [
Penta- +
decatoic .]
(Chemistry) Of, pertaining to, or derived from, pentadecane, or designating an acid related to it.
Pentadecylic Pen`ta·decyl"ic adjective [
Penta- +
decylic .]
(Chemistry) Same as Quindecylic .
Pentadelphous Pen`ta·del"phous adjective [
Penta- + Greek ... brother.]
(Botany) 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 Pen"ta·fid adjective [
Penta- + root of Latin
findere to split.]
(Botany) Divided or cleft into five parts.
Pentaglot Pen"ta·glot noun [
Penta- +
-glot , as in
polyglot .]
A work in five different tongues.
Pentagon Pen"ta·gon noun [ Greek ...; ... (see
Penta- ) +
gwni`a angle: confer Latin
pentagonium , French
pentagone .]
(Geom.) A plane figure having five angles, and, consequently, five sides; any figure having five angles. Regular pentagon ,
a pentagon in which the angles are all equal, and the sides all equal.
Pentagonal Pen·tag"o·nal adjective [ Confer French
pentagonal ,
pentagone , Latin
pentagonus ,
pentagonius , Greek ....]
Having five corners or angles. Pentagonal dodecahedron .
See Dodecahedron , and Pyritohedron .
Pentagonally Pen·tag"o·nal·ly adverb In the form of a pentagon; with five angles. Sir T. Browne.
Pentagonous Pen·tag"o·nous adjective Pentagonal.
Pentagram Pen"ta·gram noun [ Greek ..., neut. of ... having five lines. See
Penta- , and
-gram .]
A pentacle or a pentalpha. "Like a wizard
pentagram ."
Tennyson.
Pentagraphic, Pentagraphical Pen`ta·graph"ic, Pen`ta·graph"ic·al adjective [ Corrupted from
pantographic ,
- ical .]
Pantographic. See Pantograph .
Pentagynia Pen`ta·gyn"i·a noun plural [ New Latin , from Greek ... (see
Penta- ) + ... female.]
(Botany) A Linnĉan order of plants, having five styles or pistils.
Pentagynian, Pentagynous Pen`ta·gyn"i·an, Pen·tag"y·nous adjective (Botany) Of or pertaining to plants of the order Pentagyna; having five styles.
Pentahedral Pen`ta·he"dral adjective Having five sides; as, a pentahedral figure.
Pentahedrical Pen`ta·hed"ric·al adjective Pentahedral. [ R.]
Pentahedron Pen`ta·he"dron noun [
Penta- + Greek
"e`dra seat, base.]
A solid figure having five sides.
Pentahedrous Pen`ta·he"drous adjective Pentahedral. Woodward.
Pentail Pen"tail` noun (Zoology) 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 Pen·tal"pha noun [ New Latin , from Greek ...: confer French
pentalpha . See
Penta- , and
Alpha .]
A five-pointed star, resembling five alphas joined at their bases; -- used as a symbol.
Pentamera Pen·tam"e·ra noun plural [ New Latin See
Pentamerous .]
(Zoology) 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.
Pentameran Pen·tam"er·an noun (Zoology) One of the Pentamera.
Pentamerous Pen·tam"er·ous adjective [
Penta- + Greek ... part.]
1. (Biol.) 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. 2. (Zoology) Belonging to the Pentamera.
Pentamerus Pen·tam"e·rus noun [ New Latin See
Pentamerous .]
(Paleon.) A genus of extinct Paleozoic brachiopods, often very abundant in the Upper Silurian. Pentamerus limestone (Geol.) ,
a Silurian limestone composed largely of the shells of Pentamerus.
Pentameter Pen·tam"e·ter noun [ Latin , from Greek ...; ... (see
Penta- ) + ... measure.]
(Gr. & Latin Pros.) A verse of five feet. » The dactylic pentameter consists of two parts separated by a diĉresis. Each part consists of two dactyls and a long syllable. The spondee may take the place of the dactyl in the first part, but not in the second. The
elegiac distich consists of the hexameter followed by the pentameter.
Harkness.
Pentameter Pen·tam"e·ter adjective Having five metrical feet.
Pentamethylene Pen`ta·meth"yl·ene noun [
Penta- +
methylene .]
(Chemistry) A hypothetical hydrocarbon, C 5 H 10 , metameric with the amylenes, and the nucleus of a large number of derivatives; -- so named because regarded as composed of five methylene residues. Confer Trimethylene , and Tetramethylene .
Pentandria Pen·tan"dri·a noun plural [ New Latin , from Greek ... (see
Penta- ) + ..., ..., man, male.]
(Botany) A Linnĉan class of plants having five separate stamens.
Pentandrian, Pentandrous Pen·tan"dri·an, Pen·tan"drous adjective (Botany) Of or pertaining to the class Pentadria; having five stamens.
Pentane Pen"tane noun [ See
Penta- .]
(Chemistry) Any one of the three metameric hydrocarbons, C 5 H 12 , 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.
Pentangle Pen"tan`gle noun [
Pent a- +
angle .]
A pentagon. [ R.]
Sir T. Browne.
Pentangular Pen·tan"gu·lar adjective [
Pent a- +
angular .]
Having five corners or angles. [ R.]
Pentapetalous Pen`ta·pet"al·ous adjective [
Penta- +
petal .]
(Botany) Having five petals, or flower leaves.
Pentaphyllous Pen·taph"yl·lous adjective [
Penta- + Greek ... leaf.]
(Botany) Having five leaves or leaflets.
Pentapody Pen·tap"o·dy noun [
Penta- + Greek ..., ..., foot.]
(Pros.) A measure or series consisting of five feet.
Pentaptote Pen"tap·tote noun [ Latin (
pl .)
pentaptota . Greek ... with five cases; ... (see
Penta- ) + ... falling.]
(Gram.) A noun having five cases.
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