Cyclide

Geom. [a. F. cyclide, f. CYCLE.] ‘The envelope of a sphere whose centre moves on a fixed quadric, and which cuts a fixed sphere orthogonally’ (Salmon).

1874.  Salmon, Analyt. Geom. Three Dim., 496.

1881.  H. Hart, in Athenæum, 23 April, 563/2. On the Five Focal Quadrics of a Cyclide.