Penta-
Pronunciation : Pen"ta-.
Etymology : [Gr. Five.]
Definition : 1. A combining form denoting five; as, pentacapsular; pentagon.
2. (Chem.)
Defn: Denoting the degree of five, either as regards quality, property, or composition; as, pentasulphide; pentoxide, etc. Also used adjectively.
Source : Webster's Unabridged Dictionary, 1913