Lewis Short
rōrātĭo (noun F) : roro
* A falling of dew, dew.
* Lit., Vitr. 8, 2, 2.—In plur.: nocturnae,App. M. 9, p. 232, 6.
* Transf.
* The falling off of the grape in consequence of a cold dew (a disease of the grapes), Plin. 17, 24, 37, § 226.
* A dropping in the clepsydra, Cassiod. Var. 1, 48.
Charlton T. Lewis, Charles Short, A Latin Dictionary