Found 2 items, similar to Pentad.
English → English (WordNet) Definition: pentad pentad n : the cardinal number that is the sum of four and one [syn: five, 5, V, cinque, quint, quintet, fivesome, quintuplet, fin, Phoebe, Little Phoebe]
English → English (gcide) Definition: Pentad Pentad \Pen"tad\, n. [Gr. ?, ?, a body of five, fr. ? 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] Pentad \Pen"tad\, a. (Chem.) Having the valence of a pentad. [1913 Webster]