annulate

Having an annular form or shape.

Describes a fern sporangium that has an annulus.

Describes a mushroom with an annulus on the stipe.

One of the Annulata.

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

A conceptually different approach was undertaken by Schreiber and coworkers in which, rather than annulating the enediyne bridge onto a cyclohexane-type precursor, both rings were assembled in a single transformation, specifically an intramolecular Diels-Alder reaction (Scheme XII) (30).