The Collaborative International Dictionary
Wiktionary
nictitans
n. The nictitating membrane.
Usage examples of "nictitans".
But their unique horror lay in a certain filminess (it made me think of the membrana nictitans in a bird) which, obscuring them as I threw wide the door, seemed to lift as I actually passed the threshold, revealing the eyes in all their brilliant iridescence.
There's the membrana nictitans of the snakes," he mused, bethinking himself of his zoological studies.