any of various joints for transmitting motion between rotating parts, as in a timepiece
Word origin
[1520–30; alter. of gemel (orig. in pl.) twin, ME gemelles (‹ OF gemeles) ‹ L gemellus (sing.), dim. of geminus twin]This word is first recorded in the period 1520–30. Other words that entered Englishat around the same time include: ballast, bias, junior, lapse, ticket