Definitions

1. verb

to form or have a ring or rings, especially on an organ or part of an animal’s body

“The fossilized insect’s body annulated its abdomen.”

2. noun

a ring or rings, especially on an organ or part of an animal’s body

“The annulation of the caterpillar’s body was a key characteristic for its identification.”

3. adjective

having or forming rings, especially on an organ or part of an animal’s body

“The annulate structure on the insect’s head helped it navigate its surroundings.”