Having the shape of an orb or orbit; spherical; circular; discoidal; round.Rounded; complete; perfect.In entomology, having a regularly rounded surface and bordered by a circular margin: as, the orbicular pronotum of a beetle.In botany, having the shape of a flat body with a nearly circular outline: as, an orbicular leaf. Also orbiculate.n. In entomology, a circular mark or spot nearly always found on the anterior wings of the noctuid moths.In petrography, in phanerocrystal-line igneous rocks, having large spheroidal aggregations of minerals, in radial or concentric groups of megascopic crystals: as, orbicular granite, orbicular diorite.