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 'intron'
coined (1978) by W. Gilbert (1932- ), U.S. molecular biologist < intra-
(because within the gene) + -on
, as in operon