an abnormal triangular mass of thickened conjunctiva extending over the cornea and interfering with vision.
- pte·ryg·i·al, adjective
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How to use pterygium in a sentence
pterygium should be removed when advancing across the cornea, especially when the pupillary area is becoming involved.
Each consists of a basal portion, the basi-pterygium, and of a number of dermal rays.
There is always a large basi-pterygium which lies imbedded in the muscles and meets its fellow at its proximal end.
In Chimaera all three basalia are present, but the meso-pterygium is shifted and does not articulate with the pectoral girdle.
The males in Elasmobranchii and Holocephali have the distal end of the meta-pterygium prolonged into a clasper.