Medical Dictionary

r abbr.

American Heritage
Medical Dictionary

R abbr.

  1. radical (usually an alkyl or aryl group)

  2. respiration

  3. respiratory exchange ratio

  4. or r roentgen

ring (rĭng)

  1. A circular object, form, or arrangement with a vacant circular center.

  2. The area between two concentric circles; annulus.

  3. A group of atoms linked by bonds that may be represented graphically in circular or triangular form.

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