a combining form meaning “narrow,” “close,” used in the formation of compound words: stenopetalous.

< Greek stenós Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
steno- or (before a vowel) sten-
combining form
indicating narrowness or contraction: stenography; stenosis
[from Greek stenos narrow]
sten- or (before a vowel) sten-
combining form
[from Greek stenos narrow]

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

steno- pref.
Narrow; small: stenothorax.

The American Heritage® Stedman's Medical Dictionary
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