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steno-

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

From the Greek word stenós
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for steno-

steno-

before a vowel sten-

combining form
  1. indicating narrowness or contractionstenography; stenosis
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Word Origin

from Greek stenos narrow
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

steno- in Medicine

steno-

pref.
  1. Narrow; small:stenothorax.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.