Etymology
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flats (n.)

"level tidal tract," 1540s, from flat (n.) in the Middle English "level piece of ground" sense.

updated on November 21, 2014

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Definitions of flats from WordNet

flats (n.)
footwear (shoes or slippers) with no heel (or a very low heel);
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.