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(or-bik'u-lus) plural.orbiculi [L., little circle]
Muscle surrounding an orifice; a sphincter muscle.

orbiculus ciliaris

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

orbiculus oris

The circular muscle surrounding the mouth. It is a muscle of facial expression, innervated by the facial nerve.
References in periodicals archive ?
Las mangas de las tunicas remataban en punos con bandas decorativas en consonancia con los clavi, tabulae y orbiculi que completaban la decoracion.