/terrl/ , Scot.
n.
1. a wheel, cam, or any revolving mechanism or piece of machinery.
2. an allotted time for action that comes in rotation to each member of a group; turn.
v.t.
3. to rotate; turn; twirl.
v.i.
4. to make a rattling noise by spinning or revolving.
[ 1480-90; metathetic var. of TRILL 1 ]