adjective Also a·myg·da·loi·dal.
Examples from the Web for amygdaloidal
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
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
They consist almost exclusively of greenstone, becoming, in a few instances, earthy and amygdaloidal.A Manual of Elementary Geology|Charles Lyell.
The structure in one of these specimens approaches to the amygdaloidal.
Crystals are found as a rarity in the amygdaloidal cavities of igneous rocks.