Etymology
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curio (n.)

1851, "piece of bric-a-brac from the Far East," a shortening of curiosity (n.) in the "object of interest" sense (1640s). Extended by 1890s to rare or interesting bric-a-brac from anywhere.

Curioso (1650s) was a 17c.-18c. word for "one who is curious" (about science, art, etc.) also "one who admires or collects curiosities," from Italian curioso "curious person."

updated on June 07, 2018

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Definitions of curio from WordNet

curio (n.)
something unusual -- perhaps worthy of collecting;
Synonyms: curiosity / oddity / oddment / peculiarity / rarity
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.