1) Almond-shaped 2) Amygdaliform 3) Amygdaloid 4) Rounded 5) Shaped like an almond 1) Amygdaliform 2) Amygdaloid 3) Rounded 
• (a.) Pertaining to, or having the nature of, the rock amygdaloid. • (a.) Almond-shaped.
Amygdaloidal is a name given to igneous rocks, usually old lava flows, full of almond-shaped cavities which have been filled up with secondary minerals, such as calcite, agate or the zeolites. These cavities vary in size up to several centimetres across and were formed while the rock was still fluid and in motion.
A textural term describing volcanic rocks that contain numerous amygdules.