Definition of "nictitans" [nictitans]

• The winker; the third eyelid or nictitating membrane of many animals: more fully called membrana nictitans. (noun)

The Century Dictionary (Public Domain)

• "Putty-nosed monkeys Cercopithecus nictitans in West Africa use two main sounds—pyows and hacks—to warn each other about predators."
• "De Brazza's monkey Cercopithecus neglectus, greater white-nosed monkey Cercopithecus nictitans and bush pig Potamochoerus porcus have been discovered here since 1980, and Buchanan has also recorded rock hyrax Procavia ruficeps more than 200 km west of the nearest known population."
• "SYMPTOMS: Conjunctivitis and inflammation of the membranes of nictitans are very much the same."