GNU Collaborative International Dictionary of English

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1.       
   Penta- , pref. [Gr. πεντα-, a later combining form of πέντε five. See Five.]
   A combining form denoting five; as, pentacapsular; pentagon.
   1913 Webster
   (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