botryoid

from The Century Dictionary.

• Having the form of a bunch of grapes; like grapes, as a mineral presenting an aggregation of small globes.

from the GNU version of the Collaborative International Dictionary of English.

• adjective 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.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun botany A determinate inflorescence, similar to a raceme, taking the form of flowers arranged alongside an axis.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• adjective resembling a cluster of grapes in form