To pour out, as a fluid; spill; shed.Poured out freely; profuse.In botany: Very loosely spreading, as a panicle, etc.In lichenology, spread out without definite form or figure: opposed to effigurate.In zoology: In conchology, applied to shells where the aperture is not whole behind, but the lips are separated by a gap or groove.In entomology, loosely joined; composed of parts which are almost separated from one another: opposed to compact or coarctate.n. Effusion; outpouring; loss; waste.To flow, as a fluid, through an aperture or through a porous partition the openings in which are large compared with the diameter of a molecule.