Source : Webster's Revised Unabridged Dictionary (1913)

Botryoid \Bot"ry*oid\, Botryoidal \Bot`ry*oid"al\, a. [Gr. ?
   cluster of grapes + -oid.]
   Having the form of a bunch of grapes; like a cluster of
   grapes, as a mineral presenting an aggregation of small
   spherical or spheroidal prominences.

Source : WordNet®

botryoid
     adj : resembling a cluster of grapes in form [syn: {botryoidal}, {boytrose}]