Lewis Short
rĕformātio (noun F) : reformo
* A transformation (very rare).
* Lit., of a metamorphosis into an ass, App. M. 3, p. 140, 3; cf. id. ib. 11, p. 263, 19.
* Trop. and pregn., a reformation: morum,Sen. Ep. 58, 26.
Charlton T. Lewis, Charles Short, A Latin Dictionary