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[bo-tree-oid-l] /ˌbɒ triˈɔɪd l/
adjective, Mineralogy
having the form of a bunch of grapes:
botryoidal hematite.
Also, botryoid, botryose.
Origin of botryoidal
1810-20; < Greek botryoeid(ḗs) shaped like a bunch of grapes (bótry(s) bunch of grapes + -oeidēs -oid) + -al1
Related forms
botryoidally, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for botryoidal
  • 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.
British Dictionary definitions for botryoidal


(of minerals, parts of plants, etc) shaped like a bunch of grapes
Word Origin
C18: from Greek botruoeidēs, from botrus cluster of grapes; see -oid
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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botryoidal in Science
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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