noun Petrology.
  1. a volcanic rock in which rounded cavities formed by the expansion of gas or steam have later become filled with deposits of various minerals.
adjective Also a·myg·da·loi·dal.
  1. (of rocks) containing amygdules.
  2. almond-shaped.
  3. Anatomy. of or relating to an amygdala.

Origin of amygdaloid

1785–95; < Latin amygdal(a) almond + -oid Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for amygdaloid

Historical Examples of amygdaloid

British Dictionary definitions for amygdaloid


  1. a volcanic igneous rock containing amygdales
  1. having the shape of an almond
  2. a less common form of amygdaloidal (def. 1)
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

amygdaloid in Medicine


  1. Shaped like an almond.
  2. Of or relating to an amygdala.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.