limbus /lim·bus/ (lim´bus) pl. lim´bi [L.] an edge, fringe, or border.
corneal limbus the edge of the cornea where it joins the sclera. 
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Corneal limbus (limbus corneae), in a horizontal section (A) and anterior view (B) of the eye.
spiral limbus the thickened periosteum of the osseous spiral lamina of the cochlea.
limbus, corneal
The transition zone, about 1.5 mm wide, between the conjunctiva and sclera on the one hand, and the cornea on the other. Syn. corneoscleral junction. See corneal epithelium; limbal blanching; Vogt's white limbal girdle.
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