The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
A semisynthetic analogue of cephalosporin having a broad spectrum of antibiotic activity that is administered parenterally and used especially to treat systemic infections caused by susceptible microorganisms.
Origin: cephalo(sporin) + thi(o)- + -(i)n.