Where does “lucubratory” come from?

lucubratory (English) comes from Latin lucubratorius, from Latin -tōrius, from Latin -tor, from Proto-Italic -tōr, from Proto-Indo-European -tōr, from Proto-Indo-European -tor-s.

lucubratory (English): Composed by candlelight, or at night

Definitions

Composed by candlelight, or at night

Ancestry of “lucubratory”, step by step

Step	Language	Word	Meaning
1	Latin	lucubratorius	Of, pertaining to, or suitable for nighttime work...
2	Latin	-tōrius	ory
3	Latin	-tor	-er
4	Proto-Italic	-tōr	Forms agent nouns to verb stems
5	Proto-Indo-European	-tōr	Derives agent nouns from verbs, denoting someone...
6	Proto-Indo-European	-tor-s	—

Every word from Proto-Indo-European -tor-s →Every word from Latin -tor →Every word from Latin -tōrius →