n. [ Gr. penta`spenta`dos, a body of five, fr. pe`nte five. ] (Chem.) 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. [ 1913 Webster ]
n. [ Penta- + Gr. de`ka ten. ] (Chem.) 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. [ 1913 Webster ]
a. [ Penta- + Gr. 'adelfo`s brother. ] (Bot.) Having the stamens arranged in five clusters, those of each cluster having their filaments more or less united, as the flowers of the linden. [ 1913 Webster ]
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