Medical term:

orbiculi

orbiculus

(or-bik'u-lus) plural.orbiculi [L., little circle]

Muscle surrounding an orifice; a sphincter muscle.

The portion of the ciliary body consisting of a bandlike zone lying directly anterior to the ora serrata. Synonym: ciliary ring

The circular muscle surrounding the mouth. It is a muscle of facial expression, innervated by the facial nerve.

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