Definify.com
Webster 1913 Edition
Rotator
Ro-ta′tor
,Noun.
[L.]
1.
(Anat.)
that which gives a rotary or rolling motion, as a muscle which partially rotates or turns some part on its axis.
2.
(Metal.)
A revolving reverberatory furnace.
Webster 1828 Edition
Rotator
ROTA'TOR
,Noun.