The American Heritage® Dictionary of the English Language, 4th Edition
n. An acute, very contagious form of conjunctivitis, caused by the hemophilic bacterium Hemophilus aegyptius and characterized by inflammation of the eyelids and eyeballs.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. inflammation of the conjunctiva of the eye
Word Usage
"The visible mucous membranes (as the conjunctiva), from which it received the name pinkeye, and the mouth, and the natural openings become of a deep saffron, ocher, or violet-red color."