Used to express surprise or dismay.

plural of aye-aye.

The lemur Daubentonia madagascariensis, a solitary nocturnal quadruped found in Madagascar and remarkable for its long fingers, sharp nails, and rodent-like incisor teeth.

(nautical) Response to ahoy if a commissioned officer is in the boat.

(idiomatic, nautical) The correct and seamanlike reply, onboard a Royal Navy (or US Navy) ship, on receipt of an order from someone of senior rank or authority. It means "I understand the command and hasten to comply with the order."