(exercise) An exercise performed by lying in a fashion where the imaginary line between the feet and the head is parallel to the floor and the fundament is raised and lowered (optionally with weigh...

A woman who is simultaneously sister and wife to her husband. / In a polygamous marriage, a woman who is simultaneously the sister and co-wife of another. / A co-wife in general.

plural of mead moon

Propulsion that is caused by the expulsion of a jet of fluid, especially by a jet engine / The study of devices propelled by jet propulsion