lu·cu·brate \ˈlük(y)əˌbrāt\intransitive verb (-ed/-ing/-s) Etymology: Latin lucubratus, past participle of lucubrare to work by lamplight, compose by night; akin to Latin lucēre to shine — more at light : to discourse learnedly in writing : expatiate < lucubrate in various scholarly journals > — compare elucubrate • lu·cu·bra·tor\-brād.ə(r), -ātə-\noun-s