an·nu·lar \ˈanyələ(r)\adjective Etymology: Middle French or Latin; Middle French annulaire, from Latin annularis, anularis, from annulus, anulus ring — more at annulus 1. a.: of or relating to a ring : forming a ring : shaped like a ring < annular growths in the trunk of a tree > b.chemistry: cyclic 2.: banded, marked, or thickened in circles < an annular cell of a plant > • an·nu·lar·lyadverb