Etymology
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slater (n.)

"one who makes or lays slates," c. 1400 (mid-13c. as a surname), agent noun from slate.

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Definitions of slater

slater (n.)
any of various small terrestrial isopods having a flat elliptical segmented body; found in damp habitats;
Synonyms: woodlouse / wood louse
From wordnet.princeton.edu