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

“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

The molten trap broke through at various times, and presenting various appearances, but in nearly the same centre; here existing as an augitic rock, there as a syenite, yonder as a basalt or amygdaloid.

From The Cruise of the Betsey or, A Summer Ramble Among the Fossiliferous Deposits of the Hebrides. With Rambles of a Geologist or, Ten Thousand Miles Over the Fossiliferous Deposits of Scotland by Symonds, W. S. (William Samuel)

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.

This solid nucleus is covered by a kind of porous amygdaloid, called tetzontli.

From Incentives to the Study of the Ancient Period of American History An address, delivered before the New York Historical Society, at its forty-second anniversary, 17th November 1846 by Schoolcraft, Henry Rowe

It contains balls of mandelstein, or amygdaloid, eight or ten inches in diameter.

From Personal Narrative of Travels to the Equinoctial Regions of America, During the Year 1799-1804 — Volume 2 by Humboldt, Alexander von