(intransitive) To match, fit together without space between. / (intransitive) To copulate. / (intransitive) To pair in order to raise offspring. / (transitive) To arrange in matched pairs.

A joint, in flooring or panelling, made by fitting a ridge (tongue) along the edge of one board into a corresponding slot (groove) on another.

(organic chemistry) Any of a group of triterpenoid lactones present in the vine Tripterygium wilfordii

plural of eponymist