amygdaloid

[ uh-mig-duh-loid ]

/ əˈmɪg dəˌlɔɪd /

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noun Petrology.

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.

(of rocks) containing amygdules.

almond-shaped.

Anatomy. of or relating to an amygdala.

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Origin of amygdaloid

1785–95; <Latin amygdal(a) almond + -oid

Words nearby amygdaloid

amygdale, amygdalic, amygdaliform, amygdalin, amygdaline, amygdaloid, amygdaloidal, amygdule, amyl, amylaceous, amyl acetate

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use amygdaloid in a sentence

Chalcedony, apparently from amygdaloid of the trap formation, was also found at Port Warrender.
Narrative of a Survey of the Intertropical and Western Coasts of Australia] [Volume 2 of 2]|Phillip Parker King
Quartz crystals, with chalcedony, from nodules in amygdaloid.
Narrative of a Survey of the Intertropical and Western Coasts of Australia] [Volume 2 of 2]|Phillip Parker King
Purplish-brown epidote, with small nests or concretions of green epidote and quartz; forming a sort of amygdaloid.
Narrative of a Survey of the Intertropical and Western Coasts of Australia] [Volume 2 of 2]|Phillip Parker King
Masses of the two former minerals were also found imbedded in amygdaloid and trap-rock, thus denoting the parent beds of rock.
Summary Narrative of an Exploratory Expedition to the Sources of the Mississippi River, in 1820|Henry Rowe Schoolcraft

It is found in connection with isolated blocks of amygdaloid, of primitive greenstone, and of petrosilex.
Summary Narrative of an Exploratory Expedition to the Sources of the Mississippi River, in 1820|Henry Rowe Schoolcraft

British Dictionary definitions for amygdaloid

amygdaloid

/ (əˈmɪɡdəˌlɔɪd) /

noun

a volcanic igneous rock containing amygdales

adjective

having the shape of an almond

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