noun, plural amygdalae [uh-mig-duh-lee] . Anatomy.
an almond-shaped part, as a tonsil.
a ganglion of the limbic system adjoining the temporal lobe of the brain and involved in emotions of fear and aggression.

before 950; < Medieval Latin: almond, tonsil, Latin: almond < Greek amygdálē; replacing Middle English amygdal, Old English amigdal almond < Latin amygdalon < Greek amýgdalon; cf. almond Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
amygdala (əˈmɪɡdələ)
n , pl -lae
anatomy an almond-shaped part, such as a tonsil or a lobe of the cerebellum
[C16: from Medieval Latin: almond]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

"the tonsils," 1540s, from L., from Gk. amygdale "almond" (see almond). The anatomical use is as a direct transl, of Arabic al-lauzatan "the two tonsils," lit. "the two almonds," so called by Arabic physicians for fancied resemblance.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

amygdala a·myg·da·la (ə-mĭg'də-lə)
n. pl. a·myg·da·lae (-lē)

  1. An almond-shaped mass of gray matter in the front part of the temporal lobe of the cerebrum. Also called amygdaloid nucleus.

  2. The cerebellar tonsil.

  3. Any of the lymphatic tonsils.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
amygdala   (ə-mĭg'də-lə)  Pronunciation Key 
Plural amygdalae (ə-mĭg'də-lē)
An almond-shaped mass of gray matter in the front part of the temporal lobe of the cerebrum that is part of the limbic system and is involved in the processing and expression of emotions, especially anger and fear.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The amygdala is a peanut-size nucleus found deep in the midbrain.
Each lobe includes an amygdala and a seahorse-shaped structure called the
If you want to know terror, you must travel deep inside the brain to the
  almond-shaped region known as the amygdala.
With the amygdala constantly contradicting the neocortex, your gray matter
  tends to see lots of red alerts.
Images for amygdala
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