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botryoidal

[bo-tree-oid-l]
adjective Mineralogy.
  1. having the form of a bunch of grapes: botryoidal hematite.
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Also bot·ry·oid, botryose.

Origin of botryoidal

1810–20; < Greek botryoeid(ḗs) shaped like a bunch of grapes (bótry(s) bunch of grapes + -oeidēs -oid) + -al1
Related formsbot·ry·oi·dal·ly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for botryoidal

botryoidal

botryose (ˈbɒtrɪˌəʊs, -ˌəʊz)

adjective
  1. (of minerals, parts of plants, etc) shaped like a bunch of grapes
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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

botryoidal in Science

botryoidal

[bŏt′rē-oidl]
  1. Shaped like a bunch of grapes. Certain minerals and parts of organisms can be botryoidal.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.