Annular

An·nu·lar

Annular

a.
  1. Pertaining to, or having the form of, a ring; forming a ring; ringed; ring-shaped; as, annular fibers.
  2. Banded or marked with circles.

Phrases & Compounds

Annular eclipse
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.