The geologist examined the annulus around the volcanic vent to understand past eruptions.

The field guide described the mushroom as having a single annulus beneath its cap, characteristic of some agarics.

The apical annulus near the top of the mushroom's stem provided a key clue for identifying the species.

The field guide noted that the species is characterized by a double annulus near the stipe, which is rare among similar mushrooms.

In the field guide, the specimen was identified by its attached annulus, which remained firmly fixed to the stem even in mature mushrooms.

The surgeon carefully inspected the annulus fibrosus to assess the integrity of the heart's valve support.

During the anatomy lecture, the professor used a model to show how the annulus of Zinn anchors the extraocular muscles around the optic nerve.

To calculate the area of the square annulus, subtract the area of the inner square from that of the outer square.

The engineer designed a gasket composed of multiple concentric annuluses to ensure a secure seal under high pressure.