Etymology
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levator (n.)

1610s in anatomy, "type of muscle that raises or elevates," from medical Latin levator (plural levatores) "a lifter," from Latin levatus, past participle of levare "to raise, lift up; make lighter" (from PIE root *legwh- "not heavy, having little weight"). Opposed to depressor.

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Definitions of levator

levator (n.)
a muscle that serves to lift some body part (as the eyelid or lip);
From wordnet.princeton.edu