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a combining form borrowed from Greek, where it meant “fat”, used with this meaning, and with reference to stearic acid and its related compounds, in the formation of compound words:
stearoptene; stearoyl.
Also, especially before a vowel, stear-.
Origin of stearo-
combining form representing Greek stéar fat, grease; cf. steato- Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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stearo- in Medicine

stearo- or stear-
Fat: stearate.

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