having the form of a ring.
(of a carpenter's nail) having a series of concentric grooves to improve holding power.

1565–75; < Latin annulāris, equivalent to annul(us) ring (variant of ānulus) + -āris -ar1

annularity, noun
annularly, adverb
interannular, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
annular (ˈænjʊlə)
ring-shaped; of or forming a ring
[C16: from Latin annulāris, from annulus, ānulus ring]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

"ring-shaped," 1570s, from L. annularis, from annulus, dim. of anus "ring" (see anus). An annular eclipse (1727) is one in which the dark body of the moon is smaller than the disk of the sun, so that at the height of it the sun appears as a ring of light.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

annular an·nu·lar (ān'yə-lər)
Shaped like or forming a ring.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
annular   (ān'yə-lər)  Pronunciation Key 
Forming or shaped like a ring.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
It is concave from before backward, and its prominent extremities serve for the attachment of the annular ligament.
Most reports state that only an annular blowout preventer was installed.
It hops up and down, incongruous with the annular aggression of the red spike.
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