Definition of lucubrate in US English:

lucubrate

verb

[no object]archaic
  • 1Write or study, especially by night.

    1. 1.1 Produce scholarly written material.
      hold forth, expatiate, pontificate
      View synonyms

Origin

Early 17th century: from Latin lucubrat- ‘(having) worked by lamplight’, from the verb lucubrare.

Pronunciation

lucubrate

/ˈlo͞ok(y)əˌbrāt//ˈluk(j)əˌbreɪt/