ppl. a. Dynamics. [CONTRA- 3.] (See quots.)
1866. Sylvester, in Phil. Trans., 771. Contrarelated solid bodies, whose kinematical exponents are contrafocal ellipsoids.
1868. Routh, Rigid Dynamics, 358. The momental ellipsoids of these bodies are contrafocal … The bodies themselves are said to be contrarelated.
