(pathology) An extremely painful, cyclical and unilateral headache.

An explosive munition designed to explode in the air and release a cluster of smaller explosives, thus spreading the blast over a larger area.

Alternative form of clusterfuck

(astronomy) a densely-packed spherical star cluster containing thousands to millions of stars

(astronomy) A group of gravitationally bound stars and other material (such as nebulae and planets), conventionally with one generation of similarly aged stars from the same pre-stellar nebula.

(astronomy) a more or less irregular star cluster containing tens to thousands of stars

(astronomy, galaxies) A cluster of hundreds of galaxies.

(astronomy) Alternative form of supercluster

(computing) A cluster of standard personal computers linked by a local area network, usually on the order of 10 nodes.

(chemistry) An assemblage of atoms or molecules bound together