D defs.my
Entry 2 senses Webster, 1913

Rotator

· Ro·ta·tor · IPA
01 n. that which gives a rotary or rolling motion, as a muscle which partially rotates or turns some part on its axis.
  1. 1.
    that which gives a rotary or rolling motion, as a muscle which partially rotates or turns some part on its axis.(Anat.)
  2. 2.
    A revolving reverberatory furnace.(Metal.)