‖n. pl. [ NL. See Pentamerous. ] (Zool.) 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. [ 1913 Webster ]
a. [ Penta- + Gr. &unr_; 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. [ 1913 Webster ]
2. (Zool.) Belonging to the Pentamera. [ 1913 Webster ]
n. [ L., fr. Gr. &unr_;; &unr_; (see Penta-) + &unr_; measure. ] (Gr. & L.Pros.) A verse of five feet. [ 1913 Webster ]
☞ The dactylic pentameter consists of two parts separated by a diæresis. 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. [ 1913 Webster ]
n. [ Penta- + methylene. ] (Chem.) 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. [ 1913 Webster ]
(n) a drug used as a circulatory and respiratory stimulant; larger doses cause convulsions in shock therapy; Metrazol is a trademark, Syn.Metrazol, pentamethylenetetrazol
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