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English word cheerio comes from Proto-Indo-European *ḱrh₂esn, Proto-Indo-European *ḱerh₂-, Latin cera, Late Latin cara, and later Latin cara (Face.)
*ḱrh₂esn (Proto-Indo-European)
*ḱerh₂- (Proto-Indo-European)
cera (Latin)
A wax image. A wax seal. A writing tablet covered with wax. Wax, beeswax, honeycomb.
cara (Late Latin)
κάρα (Ancient Greek)
cara (Latin)
Face.
ciere (Old French)
cheer (English)
(archaic) One's attitude, mood. [from 14thc.]. (obsolete) One's expression or countenance. [13th-19thc.]. (obsolete) The face. [13th-16thc.]. (uncountable) A cheerful attitude; gaiety; mirth. [from 14thc.]. A chant made in support of a team at a sports event.. A cry expressing joy, approval or support such as "hurray". [from 18thc.]. That which promotes good spirits or cheerfulness; [...]
cheerio (English)
(NZ, AU) A small saveloy often consumed with tomato sauce at parties. (British, Ireland, New Zealand, Australia, informal) a greeting or parting.