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.

---

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

---

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

It is surrounded by pyroxenic amygdaloid; it would no doubt be seen below, issuing immediately from gneiss-granite, like the phonolite of Biliner Stein, in Bohemia, which contains fragments of gneiss embedded in its mass.

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

Remember that unsoaked peas are hard, forcible, and surcharged with a nitrogenous amygdaloid that is in reality what chemical science calls putrate of lead.

From Further Foolishness by Leacock, Stephen

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 Lyell, Charles, Sir

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)