(astronomy) A compact region at the center of a galaxy that has a much higher than normal luminosity over at least some portion, and possibly all, of the electromagnetic spectrum.

(chemistry) An amorphous, gelatinous substance containing nitrogen, found in milk and other animal fluids. It resembles peptone, and is variously regarded as a coagulating or emulsifying agent.

(astronomy, galaxies) plural of galaxy cluster

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

plural of galaxy group

(astronomy) A group of galaxies that hold together gravitationally.

(biochemistry) An enzyme that produces galactose by the hydrolysis of lactose

(astronomy) An aggregation of individual stars, dust, and gas (and possibly dark matter) that surrounds a galaxy

plural of galactin

A particular α-galactoside.