nounWord forms: plural ˈsternums or ˈsterna
a thin, flat structure of bone and cartilage to which most of the ribs are attached in the front of the chest in most vertebrates; breastbone
Webster’s New World College Dictionary, Fourth Edition, compiled by the
editors of Webster’s New World Dictionaries. Copyright © 2010 by Houghton
Mifflin Harcourt. Published by Houghton Mifflin Harcourt. All rights reserved.
Word origin of 'sternum'
ModL < Gr sternon,
the breastbone < IE base *ster-,
to spread out, strew