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annulation

British  
/ ˌænjʊˈleɪʃən /

noun

  1. the formation of rings

  2. a ringlike formation or part

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

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Said Gálvez: “The Mexican government should act with firmness in defense of our compatriots and push for ... the annulation of this law, which attacks our brother and sister migrants.”

From Los Angeles Times • Mar. 20, 2024

They also asked for an immediate annulation of the new diesel tax and a halt to new auto regulations.

From Slate • Dec. 4, 2018

The absence of setae and the great secondary annulation render the mapping of the segments a subject of some difficulty.

From Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 7 "Cerargyrite" to "Charing Cross" by Various

The distinguishing feature is the transverse annulation of the bell.

From Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 by Calkins, Gary N. (Gary Nathan)

The annulation of the external surface is due to numerous thickened areas of the ectocyst which take the form of slender rings surrounding the zoœcium; they are most conspicuous on its distal half.

From Freshwater Sponges, Hydroids & Polyzoa by Annandale, Nelson