amygdaloid

[ uh-mig-duh-loid ]

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.

adjective

1. (of rocks) containing amygdules.
2. almond-shaped.
3. Anatomy. of or relating to an amygdala.

amygdaloid

/ əˈmɪɡdəˌlɔɪd /

noun

1. a volcanic igneous rock containing amygdales

adjective

1. having the shape of an almond
2. a less common form of amygdaloidal

Word History and Origins

Origin of amygdaloid¹

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

Pertaining to, or having the nature of, the rock amygdaloid.

From Project Gutenberg

Hearne, and Franklin, and Richardson all report native copper on the lower river—amygdaloid beds that crop out in sheer cliffs.

From Project Gutenberg

As the tedious road wound on over basalt, basaltic lava, and amygdaloid, the sun, waxing momentarily more intensely powerful, was reflected with destructive and stifling fervour from slates of snow-white sea-limestone borne on their tops.

From Project Gutenberg

Such mineral waters must, in the course of time, create great changes in many rocks; especially in lavas, the pores of which they may fill with calcareous spar, so as to convert them into amygdaloids.

From Project Gutenberg