amygdaloidal

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 Also a·myg·da·loi·dal.

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

adjective

1. (of a volcanic rock) containing amygdales
2. a less common form of amygdaloid (def. 2)

noun

1. a volcanic igneous rock containing amygdales

adjective

2. having the shape of an almond
3. a less common form of amygdaloidal (def. 1)

adj.

1. Shaped like an almond.
2. Of or relating to an amygdala.