plural of ratchet coupling

plural of coupling rod

(rail transport) A rod that couples the driving wheels of a locomotive, a steam locomotive in particular, so that the driving wheels act together as a unit.

Alternative form of couple three

(colloquial, US) Two or three or a similarly small number of.

plural of Sonogashira coupling

(organic chemistry) A crosscoupling reaction used in organic synthesis to form carbon–carbon bonds. It employs a palladium catalyst as well as copper co-catalyst to form a carbon–carbon bond between a terminal alkyne and an aryl or vinyl halide.

Attached, coupled or fixed close together.

(rail transport, UK, historical) Of older railway wagons, having a chain coupling between them, without the buffers on each wagon touching those of the next wagon when the train was in motion.

Two people who have a special connection or are in a relationship but who are completely different from each other; mismatched couple.