Annulus
Annulus (well)
Annulus (mathematics)
Monetaria annulus
Annulus theorem
Annulus fibrosus
Annulus (mycology)
Annulus (botany)
Ischnocodia annulus
Sphaerocoris annulus
Annulus (firestop)
Phyllogomphus annulus
Pupillaea annulus
Annulus (zoology)
Mitral valve
Common tendinous ring
Cardiac skeleton
Intervertebral disc
Fossa ovalis (heart)
Inguinal canal
Umbilical ring
Femoral ring
Ciliary body
Tomato ringspot virus
Ring of the Fisherman