The Clue
Bridge builder's grp. (3 letter answer)
The Answer
ADA
Tags
Notes
The answer ADA is very common and appears about once every 47 puzzles.
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Definition
ADA as a noun:
1. (adenosine deaminase, ADA) = an enzyme found in mammals that can catalyze the deamination of adenosine into inosine and ammonia; "ADA deficiency can lead to one form of severe combined immunodeficiency disease"; "the gene encoding ADA was one of the earlier human genes to be isolated and cloned for study"