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

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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

I did not see there any pyroxene; but on the very spot I recognized a number of crystals in the amygdaloid, which appears so strongly linked to the grunstein that they alternate several times.

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

The greyish blue amygdaloid contains fendilated crystals of pyroxene and mesotype.

From Personal Narrative of Travels to the Equinoctial Regions of America, During the Year 1799-1804 — Volume 3 by Alexander von Humboldt

The older rocks of the island consist, in a great measure, of that kind of basaltic lava called dolerite, sometimes columnar, and partly of common basalt and amygdaloid.

From Principles of Geology or, The Modern Changes of the Earth and its Inhabitants Considered as Illustrative of Geology by Sir Charles Lyell

The rock here might have been taken for decomposed amygdaloid but, having found the vestiges of an old crater in the summit of the hill, I was induced to consider it an ancient lava.

From Three Expeditions into the Interior of Eastern Australia, Volume 2 by Thomas Mitchell

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