annulate

Short definition from Wiktionary

Adjective

1. 1
   Having an annular form or shape.
2. 2
   Describes a fern sporangium that has an annulus.
3. 3
   Describes a mushroom with an annulus on the stipe.

Noun

1. 1
   One of the Annulata.

Verb

1. 1
   To cause (something) to undergo an annulation reaction (a reaction which forms a ring of atoms).