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From The Collaborative International Dictionary of English v.0.48:
Annular \An"nu*lar\, a. [L. annularis, fr. annulis ring: cf. F. annulaire.] 1. Pertaining to, or having the form of, a ring; forming a ring; ringed; ring-shaped; as, annular fibers. [1913 Webster] 2. Banded or marked with circles. [1913 Webster] Annular eclipse (Astron.), an eclipse of the sun in which the moon at the middle of the eclipse conceals the central part of the sun's disk, leaving a complete ring of light around the border. [1913 Webster]