Source : Webster's Revised Unabridged Dictionary (1913)

Semitransparent \Sem`i*trans*par"ent\, a.
   Half or imperfectly transparent.

Source : WordNet®

semitransparent
     adj : almost transparent; allowing light to pass through
           diffusely; "translucent amber"; "semitransparent
           curtains at the windows" [syn: {translucent}]