What does botryoid or botryoidal mean?
The definition of botryoid and botryoidal
Bot”ry*oid, Bot`ry*oid”al, a.
Etym: [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.