(cytology, dated) The substance from which attraction spheres develop in mitotic cell division, and of which they consist.

An act of rocking; a rocking motion; a sway.

(astrophysics) A theoretical maximum radius of a star of given mass; the radius at which the inward force of gravity exactly balances the outward pressure of the gas of the star.

a binary star in the Pleiades star cluster in the constellation Taurus.