noun (plural ais)
The three-toed sloth.
- The people of these areas call the 3-toed sloth "ai" after its shrill cry("ai-ai!").
- There are three-toed sloths, among which is the ai, and the two-toed sloths, among which is the unau.
- Three-toed sloths are also known as ai by the Guarani people of South America.
Early 17th century: from Tupi, imitative of its cry.