Source : Webster's Revised Unabridged Dictionary (1913)

Cementitious \Cem`en*ti"tious\, a. [L. caementitius pertaining
   to quarry stones. See {Cement}, n. ]
   Of the nature of cement. [R.] --Forsyth.

Source : WordNet®

cementitious
     adj : like or relevant to or having the properties of cement; "the
           adhesion of cementitious materials"