annulate

adj

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. (transitive)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).”