World English Dictionary
hygroma or hydroma (haɪˈɡrəʊmə, haɪˌdrəʊmə)
pathol a swelling in the soft tissue that occurs over a joint, usually caused by repeated injury
[C20: from hygro- + -oma]
hydroma or hydroma
[C20: from hygro- + -oma]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

hygroma hy·gro·ma (hī-grō'mə)
n. pl. hy·gro·mas or hy·gro·ma·ta (-mə-tə)
A cystic swelling containing a serous fluid. Also called hydroma.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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