aciniform

from The Century Dictionary.

• Having the form of grapes, or being in clusters like grapes; acinose.
• In anatomy, of a deep purplish tint; resembling a grape in color: applied to one of the pigmentary layers of the iris, technically called the tunica aciniformis.

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

• adjective Having the form of a cluster of grapes; clustered like grapes.
• adjective Full of small kernels like a grape.

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

• adjective Having the form of a cluster of grapes; clustered like grapes.
• adjective Full of small kernels like a grape.