adjective Mineralogy.
having the form of a bunch of grapes: botryoidal hematite.
Also, botryoid, botryose.

1810–20; < Greek botryoeid(ḗs) shaped like a bunch of grapes (bótry(s) bunch of grapes + -oeidēs -oid) + -al1

botryoidally, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
botryoidal or botryose (ˌbɒtrɪˈɔɪdəl, ˈbɒtrɪˌəʊs, -ˌəʊz)
(of minerals, parts of plants, etc) shaped like a bunch of grapes
[C18: from Greek botruoeidēs, from botrus cluster of grapes; see -oid]
botryose or botryose
[C18: from Greek botruoeidēs, from botrus cluster of grapes; see -oid]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
botryoidal   (bŏt'rē-oid'l)  Pronunciation Key 
Shaped like a bunch of grapes. Certain minerals and parts of organisms can be botryoidal.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Glauconite grains are typically dark green and have botryoidal shapes.
The basal clay-silt has extensive cylindrical burrows filled with fine-grained, light- to medium-green botryoidal glauconite.
Late-stage botryoidal pyrite and siderite are present in some deposits.
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