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Lucimeter
- an instrument for measuring the intensity of light; a photometer.
Lucrific
- Producing profit; gainful.
Luctation
- Effort to overcome in contest; struggle; endeavor.
Luctual
- Producing grief; saddening.
Lucubrator
- One who studies by night; also, one who produces lucubrations.
Lucubratory
- Composed by candlelight, or by night; of or pertaining to night studies; laborious or painstaking.