sterno-

Also especially before a vowel, stern-.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

sterno- in Medicine

sterno-

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