serenum
From LSJ
λέγεται δὲ καὶ κλῶνας αὐτῆς θύραις ἢ θυρίσι προστεθέντας ἀποκρούειν τὰς τῶν φαρμάκων κακουργίας → its branches attached to doors or windows are said to repel the evil of spells
Latin > English
serenum sereni N N :: fair weather
Latin > French (Gaffiot 2016)
sĕrēnum,¹² ī, n. (serenus), temps serein : sereno Liv. 31, 12, 5, par un temps serein, cf. Liv. 37, 3, 2 ; Sen. Nat. 2, 18 || pl. serena Virg. G. 1, 393, temps serein ; serena cæli Lucr. 2, 1100, les espaces sereins du ciel.