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kiddo

[kid-oh]
noun, plural kid·dos, kid·does.
  1. Informal. (used as a familiar form of address.)
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Origin of kiddo

First recorded in 1880–85; kid1 + -o
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Word Origin and History for kiddos

kiddo

n.

1893, familiar form of kid (n.) in the "child" sense.

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Online Etymology Dictionary, © 2010 Douglas Harper