collarette(redirected from Biett's collarette)
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1. a narrow rim of loosened keratin overhanging the periphery of a circumscribed skin lesion, attached to the normal surrounding skin.
2. an irregular jagged line dividing the anterior surface of the iris into two regions, the pupillary zone and the ciliary zone.
Biett's collarette a type of papular syphilid in which the central papule is surrounded by a ring of scales.
1. The sinuous, scalloped line in the iris that divides the central pupillary zone from the peripheral ciliary zone and marks the embryonic site of the atrophied minor vascular circle of the iris.
2. Brittle scales encircling eyelashes in staphylococcal blepharitis.
Synonym(s): iris frill
Mycology A rim of cell wall material at the tip of a phialide, resulting from the tip’s rupture during the release of the first phialoconidium