amygdaloid

American  

[uh-mig-duh-loid] / əˈmɪg dəˌlɔɪd /

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.

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adjective

1. (of rocks) containing amygdules.

2. almond-shaped.

3. Anatomy. of or relating to an amygdala.

amygdaloid British  

/ əˈmɪɡdəˌlɔɪd /

noun

1. a volcanic igneous rock containing amygdales

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adjective

1. having the shape of an almond

2. a less common form of amygdaloidal

Etymology

Origin of amygdaloid

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

Example Sentences

See Examples For:

amygdaloid

“There was one subgroup of those that had a lot of amygdaloid and cingulate cortex type of activity, so they stood out.”

From Salon ● Mar. 9, 2014

Together with the cavities formed by amygdaloid chambers and crevices caused by erosion, they give the cliffs the appearance of a huge, irregular honeycomb.

From The Delight Makers by Bandelier, Adolph Francis Alphonse

The amygdaloidal masses, contained in the amygdaloid, are either entirely pistacite, or pistacite enclosing calc-spar.

From A Journey from Prince of Wales's Fort in Hudson's Bay to the Northern Ocean in the Years 1769, 1770, 1771, 1772 New Edition with Introduction, Notes, and Illustrations by Tyrrell, J. B.

A nodule of amygdaloid, a coarse pebble enveloped in a whitish semi-crystalline paste, lies on the table before me.

From Lippincott's Magazine of Popular Literature and Science Volume 12, No. 31, October, 1873 by Various

It is tetzontli, the porous amygdaloid which abounds among the porphyritic hills, a beautiful building-stone, easily worked, and durable.

From Anahuac : or, Mexico and the Mexicans, Ancient and Modern by Tylor, Edward Burnett