a combining form representing urethra, in compound words: urethroscope.
Also, especially before a vowel, urethr-.
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Medical Dictionary

urethro- or urethr-
Urethra; urethral: urethroscope.

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