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The Collaborative International Dictionary
Pentatomic

Pentatomic \Pen`ta*tom"ic\, a. [Penta- + atomic.] (Chem.)

  1. Having five atoms in the molecule.

  2. Having five hydrogen atoms capable of substitution.

Wiktionary
pentatomic

a. 1 (context chemistry English) Having five atoms in each molecule 2 (context chemistry English) Having five hydrogen atoms capable of substitution. alt. 1 (context chemistry English) Having five atoms in each molecule 2 (context chemistry English) Having five hydrogen atoms capable of substitution.