ē-lūcubro, āvi, ātum, 1, v. a. (elucu-bror, deponent:
epistolam, quam eram elucubratus, Cic. Att. 7, 19), to compose by lamplight , i. e. at night , with great labor , Cic. Brut. 90 fin. ; Tac. Or. 9; Col. 10 praef. fin.
ē-lūcubrō āvī, ātus, āre, to work out at night, toil over: librum, Ta.: causae tamquam elucubratae,...
An Elementary Latin Dictionary