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From: Webster's Revised Unabridged Dictionary (1913)

 Pen·ta- pref.
 1. A combining form denoting five; as, pentacapsular; pentagon.
 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.
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