From The Collaborative International Dictionary of English v.0.48:

Annular \An"nu*lar\, a. [L. annularis, fr. annulis ring: cf. F.
   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]
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