Source : Webster's Revised Unabridged Dictionary (1913)

Whitish \Whit"ish\, a. [From {White}.]
   1. Somewhat white; approaching white; white in a moderate
      degree.

   2. (Bot.) Covered with an opaque white powder.

Source : WordNet®

whitish
     adj 1: resembling milk in color or cloudiness; not clear; "milky
            glass" [syn: {milky}, {milklike}]
     2: tending toward white [syn: {off-white}]