LUCUBRATE
Source: 566, 567
lucubrate. Lucubrate, v.i. to watch, to study hard and late
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Lu″cu‐brate (?), v. i. [imp. & p. p. Lucubrated (?); p. pr. & vb. n. Lucubrated (?).] [[L. lucubratus, p. p. of lucubrare to work by lamplight, fr. lux light. See Light, n.]] To study by candlelight or a lamp; to study by night.