What is the Latin word for day-book?

The usual Latin words for “day-book” are fīlius, adversārius. The right choice depends on the sense; see the distinctions below.

English → Latin

“day-book” in Latin

fīliusa son; any male descendant; children adversāriusadverse, hostile

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

day-book

ephemeris, idis, f. (ἐφημερίς) or pure Latin, commentarii diurni: adversaria, plur.: to enter anything into a day-book, aliquid in commentarios diurnos referre; aliquid in libellum memoriae causa referre: to keep a day-book (= journal), facta dictaque describere per dies.

Quick answer

What is the Latin word for day-book?: The usual Latin words for “day-book” are fīlius, adversārius. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.