Orthodontists' org (3)

I believe the answer is:

ada

(Other definitions for ada that I've seen before include "Novel by Vladimir Nabokov" , "- Lovelace, Byron's daughter & computer pioneer" , "-- Lovelace, pioneer in computing" , "Palindromic girl's name" , "Programming language" .)

I've seen this clue in the LA Times, the Wall Street Journal, the Newsday, the Universal and the Family Time.

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