Webster's Revised Unabridged Dictionary · 1913

Aye-aye

Aye-aye ({not transcribed}) , noun

[From the native name, prob. from its cry.]

(Zoology) A singular nocturnal quadruped, allied to the lemurs, found in Madagascar (Cheiromys Madagascariensis), remarkable for its long fingers, sharp nails, and rodent-like incisor teeth.