Jake and Amy's baby, on "Brooklyn Nine-Nine" (3)

I believe the answer is:

mac

(Other definitions for mac that I've seen before include "Waterproof raincoat, in short" , "one used in shower?" , "A rainproof" , "Waterproof coat (colloq.)" , "Coat - computer" .)

I've seen this clue in the LA Times.

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