Resembling an annulus or ring. An annular eclipse takes place when the apparent diameter of the moon is less than that of the sun, and a zone of light surrounds the moon while central.
·adj Banded or marked with circles. II. Annular ·adj Pertaining to, or having the form of, a ring; ...
Webster's Dictionary of the English Language
A contrivance for fitting scuppers so that the whole can be enlarged by a movable concentric ring, i...
The Sailor's Word-Book