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Wordnet 3.0

NOUN (1)

1. the cardinal number that is the sum of four and one;
[syn: five, 5, V, cinque, quint, quintet, fivesome, quintuplet, pentad, fin, Phoebe, Little Phoebe]


The Collaborative International Dictionary of English v.0.48:

Pentad \Pen"tad\, n. [Gr. penta`s penta`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] 2. Any grouping of five things. [PJC]
The Collaborative International Dictionary of English v.0.48:

Pentad \Pen"tad\, a. (Chem.) Having the valence of a pentad. [1913 Webster] Pentadactyl
WordNet (r) 3.0 (2006):

pentad n 1: the cardinal number that is the sum of four and one [syn: five, 5, V, cinque, quint, quintet, fivesome, quintuplet, pentad, fin, Phoebe, Little Phoebe]