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lumbricalis one of four small muscles in the palm of the hand that are connected by tendons to each of the fingers. [2 definitions]
lumbricoid resembling an earthworm. [2 definitions]
lumen a unit of measure of the flow of light, equal to the flow from a light source of one-candle strength, measured on a unit surface at a unit distance. (abbr.: lm) [2 definitions]
luminance the state or quality of emitting or reflecting light. [2 definitions]
luminary a body that radiates or reflects light, such as the sun or moon. [3 definitions]
luminesce to emit light at a fairly cold temperature; be or become luminescent.
luminescence the production of light not caused directly by heat, as by chemical reaction. (Cf. incandescence.) [2 definitions]
luminescent of or characterized by luminescence.
luminiferous producing or transmitting light.
luminosity the state of being luminous. [2 definitions]
luminous giving off light; glowing. [3 definitions]
lummox (informal) someone who is especially clumsy, slow, and unintelligent.
lump a mass or pile, esp. a small one. [7 definitions]
lumpen designating uprooted and disenfranchised people who have come to be regarded as the lowest in their social class.
lumpish resembling or having the characteristics of a lump. [3 definitions]
lump sum a sum of money, esp. a total amount, that is paid at one time rather than in installments.
lumpy full of or covered with lumps. [2 definitions]
lumpy jaw see "actinomycosis."
Luna in Roman mythology, the goddess of the moon; Selene.
lunacy mental derangement; insanity. [2 definitions]
luna moth a large pale-green North American moth with a crescent-shaped spot on each wing and long tail-like projections on the hind wings.