(zoology) One of the Annulata.

Capable of being annulled.

The person or authority that annuls.

The formation of a ring / (organic chemistry) Any reaction that forms a ring of atoms / Any structure in the form of a ring

plural of annulation

(obsolete) Annulment.

Having rings / (organic chemistry) Composed of several fused rings

(zoology) A circular band formed by two transverse grooves in the cuticle of some nematodes with consequent apparent segmentation; annulus.

plural of annule

plural of annullation