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anulus Definition

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anulus
noun(an-nu-lus)
a ringlike part, structure, or marking; especially : any of various ringlike anatomical parts (as the inguinal ring)
anulus
noun(an-nu-lus)
a ring of fibrous tissue (such as that surrounding a heart valve); especially : the outer portion of an intervertebral disk that surrounds the nucleus pulposus and is composed chiefly of layers of collagen fibers

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