What is Animus Furandi?

Legal Definition
Crim. law. The intention to steal. In order to comstitute larceny, (q. v.) the thief must take the property anino furandi; but this, is expressed in the definition of larceny by the word felonious. 3 Inst. 107; Hale, 503; 4. Bl. Com. 229. Vide 2 Russ. on Cr. 96; 2 Tyler's R. 272. When the taking of property is lawful, although it may afterwards be converted animo furandi to the taker's use, it is not larceny. 3 Inst. 108; Bac. Ab. Felony, C; 14 Johns. R. 294; Ry. & Mood. C. C. 160; Id. 137; Prin. of Pen. Law, c. 22, 3, p. 279, 281.
-- Bouviers Law Dictionary
Legal Definition
The intention to steal. Gardner v. State, 55 N. J. Law, 17, 26 Atl. 30; State v. Slingerland, 19 Nev. 135, 7 Pan. 280.
-- Black's Law Dictionary