Chiefly British Used in greeting or parting.(interjection)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "cheerio" in a sentence
"The cheerio is robust enough to float in your milk for some time without succumbing to the dreaded cereal sog, an enemy of mine that rules out the eating of any "flake" cereal."
"My presonal favorite are the multi grain ones, though the humble standard cheerio is much loved in my house too."
"Long before we were all fearful and protective and the world was fraught with recalls over choking hazards and worries of childhood diabetes brought on by too much sugar and whole grains were hailed as the new food messiah, the cheerio was the perfect cereal, designed with all of that in mind and more."