[bey-tuh-meth-uh-sohn or, esp. British, bee-]
noun Pharmacology.
a synthetic analogue of a glucocorticoid, C 22 H 29 FO 5 , used in various forms in the treatment of inflammation, allergies, and tumors, and for replacement therapy in adrenal insufficiency.

perhaps beta + meth(yl) + -a- connective vowel + (hydrocorti)sone, components of the chemical name Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Medical Dictionary

betamethasone be·ta·meth·a·sone (bā'tə-měth'ə-sōn', bē'-)
A synthetic crystalline glucocorticoid powder used as a topical antiinflammatory agent for the treatment of dermatological conditions.

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
Unlike other drugs with these effects, betamethasone does not cause water retention.
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