Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun One that rotates.
  • noun Anatomy A muscle that serves to rotate a part of the body.

from The Century Dictionary.

  • noun One who or that which rotates, or causes rotation; any rotational agency or instrument.
  • noun Specifically, in anatomy, a muscle that produces a rolling or rotatory motion of a part; a muscle which rotates a part upon its own axis.
  • noun In metal-working, a revolving or rotary furnace.
  • noun In photometry, a mounting for an incandescent lamp so constructed that the lamp may be given a rapid rotation about its polar axis. By means of such a device the mean horizontal intensity of the lamp may be determined from a single photometric setting.
  • noun In mathematics, a quantity having magnitude, direction, and position; a rotor.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Anat.) that which gives a rotary or rolling motion, as a muscle which partially rotates or turns some part on its axis.
  • noun (Metal.) A revolving reverberatory furnace.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun One that rotates.
  • noun anatomy A muscle by which a joint can be rotated.
  • noun A revolving reverberatory furnace.

Etymologies

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