2. the opening so produced
3. a fixed, gaping grin
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 'rictus'ModL < L, open mouth < pp. of ringi, to gape