nounpl. -·iums or -·ia
an abnormal, triangular mass of mucous membrane growing over the human cornea from the inner corner of the eye
Origin of pterygiumModern Latin from Classical Greek pterygion, diminutive of pteryx, wing, akin to pteron, feather
nounpl. pte·ryg·i·ums, or pte·ryg·i·a
An abnormal mass of tissue arising from the conjunctiva of the inner corner of the eye that obstructs vision by growing over the cornea.
Origin of pterygiumNew Latin from Greek pterugion diminutive of pterux pterug- wing ; see pterygoid .