Sesqui-

1 definition found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Sesqui- \Ses`qui-\ [L., one half more, one and a half.] (Chem.)
     A combining form (also used adjectively) denoting that three
     atoms or equivalents of the substance to the name of which it
     is prefixed are combined with two of some other element or
     radical; as, sesquibromide, sesquicarbonate, sesquichloride,
     sesquioxide.


     [1913 Webster]
  
     Note: Sesquidupli- is sometimes, but rarely, used in the same
           manner to denote the proportions of two and a half to
           one, or rather of five to two.
           [1913 Webster]