annular ligament

noun

: a ringlike ligament or band of fibrous tissue encircling a part:

a

: any of the transverse bands holding in place the extensor and flexor tendons of the wrist and ankle

b

: a strong band of fibers surrounding the head of the radius and retaining it in the radial notch of the ulna

called also orbicular ligament

c

: any of several strengthening bands of the tendon sheaths of the digits

d

: a ring attaching the base of the stapes to the oval window