bisextum
From LSJ
ἐπιπόλαια γὰρ λέγομεν τὰ παντὶ δῆλα → by superficial we mean those that are obvious to all
Latin > English
bisextum bisexti N N :: two day period of 24 Feb. and leap year intercalary day (Julian calendar)
Latin > German (Georges)
bisextum, s. bisextus.