pterygium: a lateral expansion of the snout of some Coleoptera.
pterygium should be removed when advancing across the cornea, especially when the pupillary area is becoming involved.
Albucasis, who conveys entire the passage on pterygium from Paul, gives figures of both these instruments.
Tension being made on the thread by an assistant, the operator sawed off the pterygium towards the apex by means of the horsehair.
The base of the pterygium was then severed with the scalpel for the plastic operation on entropion.
pterygium pte·ryg·i·um (tə-rĭj'ē-əm)
n. pl. pte·ryg·i·ums or pte·ryg·i·a (-ē-ə)
An abnormal mass of tissue arising from the conjunctiva of the inner corner of the eye that obstructs vision by growing over the cornea.