(geometry) A polyomino made up of nine squares.

(anatomy) A short venous trunk of the face that is formed by the union of veins from the pterygoid plexus and that joins with the superficial temporal vein to form a vein which contributes to the f...

One who administers punishment by whipping. / One who whips him or herself as an act of religious penitence; flagellant. / One who whips others or is whipped by others as a sexual fetish.

(astronomy) The extent of a universe within the cosmological horizon of an observer.