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The Collaborative International Dictionary of English v.0.48:

Penta- \Pen"ta-\, pref. [Gr. penta-, a later combining form of pe`nte five. See Five.] 1. A combining form denoting five; as, pentacapsular; pentagon. [1913 Webster] 2. (Chem.) Denoting the degree of five, either as regards quality, property, or composition; as, pentasulphide, containing five sulfur atoms; pentoxide, containing five oxygen atoms, etc. Also used adjectively. [1913 Webster]