Definition of botryoidal in English:

botryoidal

Line breaks: botry|oid¦al
Pronunciation: /ˌbɒtrɪˈɔɪd(ə)l
 
/

adjective

(Chiefly of minerals) having a shape reminiscent of a cluster of grapes.
More example sentences
  • Accessory minerals include earthy aggregates of clay minerals and botryoidal or stalactitic manganese oxides.
  • This is a late-formed mineral that occurs as thin botryoidal crusts with little visible crystal structure.
  • It forms spherical clusters of tightly packed radiating crystals and botryoidal crusts.

Origin

late 18th century: from Greek botruoeidēs (from botrus 'bunch of grapes') + -al.

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