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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.
Lucule
- A spot or fleck on the sun brighter than the surrounding surface.
Luculently
- In a luculent manner; clearly.
Lucullite
- A variety of black limestone, often polished for ornamental purposes.
Lucuma
- An American genus of sapotaceous trees bearing sweet and edible fruits.
Ludibrious
- Sportive; ridiculous; wanton.