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a volcanic rock in which rounded cavities formed by the expansion of gas or steam have later become filled with deposits of various minerals.
(of rocks) containing amygdules.
Anatomy. of or relating to an amygdala.
Historical Examples

There was no outlet, for it was a cul-de-sac—a natural court—such as are often found among the amygdaloidal mountains of Mexico.
The Lone Ranche Captain Mayne Reid

Occasionally we meet with igneous rocks which are more or less vesicular and amygdaloidal throughout their entire mass.
Geology James Geikie

Some specimens of variegated pebbles and jasper were found here imbedded in the amygdaloidal rock.
Narrative of a Journey to the Shores of the Polar Sea, in the years 1819-20-21-22, Volume 2 John Franklin

They consist almost exclusively of greenstone, becoming, in a few instances, earthy and amygdaloidal.
A Manual of Elementary Geology Charles Lyell.

I ascended one, and found it was capped with trap rock in amygdaloidal nodules.
Journal of an Expedition into the Interior of Tropical Australia Thomas Mitchell

Crystals are found as a rarity in the amygdaloidal cavities of igneous rocks.
Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 3 Various

An amygdaloidal variety containing calcareous spar and zeolite occurs S. of Dudley.
Drake’s Road Book of the Grand Junction Railway James Drake

The lavas comprise dark pitchstone, resembling that at Kirk Yetholm, and porphyritic and amygdaloidal andesites and basalts.
Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 1 Various

It may be traced for many miles, passing through the amygdaloidal and other traps of the hill called Normans Law.
A Manual of Elementary Geology Charles Lyell.

The amygdaloidal masses, contained in the amygdaloid, are either entirely pistacite, or pistacite enclosing calc-spar.
A Journey from Prince of Wales’s Fort in Hudson’s Bay to the Northern Ocean in the Years 1769, 1770, 1771, 1772 Samuel Hearne

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

amygdaloid a·myg·da·loid (ə-mĭg’də-loid’) or a·myg·da·loi·dal (ə-mĭg’də-loid’l)

Shaped like an almond.

Of or relating to an amygdala.


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