R / rōrātĭo
noun

rōrātĭo

gen. rōrātōnis · gender feminine · decl. 3rd
a falling of dew; dew
a falling of dew, dew.
Lit., Vitr. 8, 2, 2.—In plur.: nocturnae, App. M. 9, p. 232, 6.—
by extension
The falling off of the grape in consequence of a cold dew; a disease of the grapes
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
A dropping in the clepsydra, Cassiod. Var. 1, 48.