What does Boxing Day have to do with boxing?
from medical Latin levator "a lifter," from Latin levatus, past participle of levare "to raise" (see lever).
levator le·va·tor (lə-vā'tər)n. pl. lev·a·to·res (lěv'ə-tôr'ēz)
A surgical instrument for lifting the depressed fragments of a fractured skull.
A muscle that raises a body part.