noun, plural malleoli [muh-lee-uh-lahy] . Anatomy.
the bony protuberance on either side of the ankle, at the lower end of the fibula or of the tibula.

1685–95; < Latin: small hammer, mallet, equivalent to malle(us) hammer + -olus -ole1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
malleolus (məˈliːələs)
n , pl -li
either of two rounded bony projections of the tibia and fibula on the sides of each ankle joint
[C17: diminutive of Latin malleus hammer]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1690s, from L. malleolus, dim. of malleus "hammer" (see mallet).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

malleolus mal·le·o·lus (mə-lē'ə-ləs)
n. pl. mal·le·o·li (-lī')
A rounded bony prominence, such as those on either side of the ankle joint.

mal·le'o·lar (-lər) adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
The bridge of the nose, ear, occiput and malleolus do not have subcutaneous tissue and these ulcers can be shallow.
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