Defn: An immature comatula when it is still attached by a stem, and thus resembles a Pentacrinus.
PENTACRINUS
Pen*tac"ri*nus, n. Etym: [NL. See Penta-, and Crinum.] (Zoöl.)
Defn: A genus of large, stalked crinoids, of which several species occur in deep water among the West Indies and elsewhere.
PENTACRON
Pen*ta"cron, n.; pl. L. Pentacra, E. Pentacrons. Etym: [NL., fr. Gr.
(Geom.)
Defn: A solid having five summits or angular points.
PENTACROSTIC
Pen`ta*cros"tic, n. Etym: [Penta- + acrostic.]
Defn: 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, n. Etym: [Gr. (Chem.)
Defn: 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, a. (Chem.)