Word Study
botryoidal
CIDE DICTIONARY
botryoidal, 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; as, botryoidal hematite. [1913 Webster]
For further exploring for "botryoidal" in Webster Dictionary Online