Etymology
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slat (n.)

late 14c., earlier sclat (c. 1300), "a roofing slate, a thin, flat stone," from Old French esclat "split piece, chip, splinter" (Modern French éclat), back-formation from esclater "to break, splinter, burst," probably from Frankish *slaitan "to tear, slit" or some other Germanic source (compare Old High German slizan, Old English slitan; see slit (v.)). Meaning "long, thin, narrow piece of wood or metal" attested from 1764.

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Definitions of slat
1
slat (v.)
equip or bar with slats;
slat (v.)
close the slats of (windows);
2
slat (n.)
a thin strip (wood or metal);
Synonyms: spline
From wordnet.princeton.edu