noun
Any spherical (or nearly spherical) object.
The planet Earth.
A spherical model of Earth or other planet.
(dated or Australia, South Africa) A light bulb.
A circular military formation used in Ancient Rome, corresponding to the modern infantry square.
(slang, quite uncommon, chiefly in the plural) A woman's breast or buttock, whichever is more prominent.
(obsolete) A group.
A land snail of the genus Mesodon.
verb
(intransitive) To become spherical.
(transitive) To make spherical.