Source : Webster's Revised Unabridged Dictionary (1913)

Amygdaloid \A*myg"da*loid\, Amygdaloidal \A*myg`da*loid"al\, a.
   1. Almond-shaped.

   2. Pertaining to, or having the nature of, the rock
      amygdaloid.

Source : WordNet®

amygdaloidal
     adj : shaped like an almond [syn: {almond-shaped}, {amygdaliform},
            {amygdaloid}]