n. A little place or space; a cell; a chamberlet; generally, in bot., anat., and zoology, one of a number of small compartments or cells, separated from one another by septa, as in the tests of foraminifers; specifically, in corals, one of the spaces between the septa of the calcified cup or theca.n. In ancient catacombs and tombs of some types, a small separate chamber or recess, for the reception of a body or of an urn, etc. When the body had been placed in the loculus the opening was closed with a slab of marble, or was otherwise built up. See cuts under cinerary and columbarium.n. In zoology: Same as air-chamber, 4.