amygdule
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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.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.