annulate

Etymology
, from.

Adjective

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

Noun

 * 1)  One of the Annulata.

Verb

 * 1)  To cause (something) to undergo an annulation reaction.