Dictionary.com
definitions

botryoidal

[bo-tree-oid-l]
adjective Mineralogy.
  1. having the form of a bunch of grapes: botryoidal hematite.
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
British Dictionary definitions for botryoid

botryoidal

botryose (ˈbɒtrɪˌəʊs, -ˌəʊz)

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

Word Origin for botryoidal

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
botryoid in Medicine

botryoid

[bŏt′rē-oid′]
adj.
  1. Having numerous rounded protuberances resembling a bunch of grapes.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
botryoid in Science

botryoidal

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