amygdule


Also found in: Encyclopedia, Wikipedia.

a·myg·dule

 (ə-mĭg′dyo͞ol)
n.
A small gas bubble in igneous, especially volcanic, rock filled with secondary minerals such as zeolite, calcite, or quartz.

[Latin amygdala, almond (from its shape); see amygdala + (nod)ule.]