Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun The inner, reddish-brown portion of the adrenal glands that synthesizes, stores, and releases epinephrine and norepinephrine.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun the medulla of the adrenal gland; secretes epinephrine
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