GNU Collaborative International Dictionary of English

last match results

Found one definition

1.       
   Penta- (?), pref. [Gr. πεντα-, a later combining form of πέντε 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]