*pentad*

a. (Chem.) Having the valence of a pentad. [ 1913 Webster ]

{ } a. [ Gr. pentada`ktylos with five fingers or toes. See Penta-, and Dactyl. ] 1. (Anat.) Having five digits to the hand or foot. [ 1913 Webster ]

2. Having five appendages resembling fingers or toes. [ 1913 Webster ]

a. [ Pentadactyl + -oid. ] (Anat.) Having the form of, or a structure modified from, a pentadactyl limb. [ 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- + decatoic. ] (Chem.) Of, pertaining to, or derived from, pentadecane, or designating an acid related to it. [ 1913 Webster ]

a. [ Penta- + decylic. ] (Chem.) Same as Quindecylic. [ 1913 Webster ]