| lumbago | (noun) backache affecting the lumbar region or lower back; can be caused by muscle strain or arthritis or vascular insufficiency or a ruptured intervertebral disc | Synonyms: lumbar pain |
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| lumbar | (adjective) of or relating to or near the part of the back between the ribs and the hipbones | - |
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| lumber | (noun) an implement used in baseball by the batter | Synonyms: baseball bat |
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| (noun) the wood of trees cut and prepared for use as building material | Synonyms: timber |
| (verb) cut lumber, as in woods and forests | Synonyms: log |
| (verb) move heavily or clumsily | Synonyms: pound |
| lumbering | (adjective) slow and laborious because of weight | Synonyms: heavy, ponderous |
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| (noun) the trade of cutting or preparing or selling timber | - |
| lumberjack | (noun) a short warm outer jacket | Synonyms: lumber jacket |
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| (noun) a person who fells trees | Synonyms: faller, feller, logger, lumberman |
| lumberman | (noun) a person who fells trees | Synonyms: faller, feller, logger, lumberjack |
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| lumbermill | (noun) a mill for dressing logs and lumber | Synonyms: sawmill |
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| lumberyard | (noun) a workplace where lumber is stocked for sale | - |
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| lumbosacral | (adjective) of or relating to or near the small of the back and the back part of the pelvis between the hips | - |
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| lumbus | (noun) either side of the backbone between the hipbone and the ribs in humans as well as quadrupeds | Synonyms: loin |
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| lumen | (noun) a cavity or passage in a tubular organ | - |
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| (noun) a unit of luminous flux equal to the amount of light given out through a solid angle of 1 steradian by a point source of 1 candela intensity radiating uniformly in all directions | Synonyms: lm |
| luminaire | (noun) an electrical device used to create artificial light by use of an electric lamp; all light fixtures have a fixture body and a light socket to hold the lamp and allow for its replacement | Synonyms: light fitting, light fixture |
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| luminance | (noun) the quality of being luminous; emitting or reflecting light | Synonyms: brightness, brightness level, light, luminosity, luminousness |
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| luminary | (noun) a celebrity who is an inspiration to others | Synonyms: guiding light, leading light, notability, notable |
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| luminesce | (verb) be or become luminescent; exhibit luminescence | - |
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| luminescence | (noun) light from nonthermal sources | Synonyms: glow |
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| (noun) light not due to incandescence; occurs at low temperatures | - |
| luminescent | (adjective) emitting light not caused by heat | - |
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| luminism | (noun) an artistic movement in the United States that was derived from the Hudson River school; active from 1850 to 1870; painted realistic landscapes in a style that pictured atmospheric light and the use of aerial perspective | - |
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| luminosity | (noun) the quality of being luminous; emitting or reflecting light | Synonyms: brightness, brightness level, light, luminance, luminousness |
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| luminous | (adjective) softly bright or radiant | Synonyms: aglow, lambent, lucent |
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| luminousness | (noun) the quality of being luminous; emitting or reflecting light | Synonyms: brightness, brightness level, light, luminance, luminosity |
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| lumma | (noun) 100 lumma equal 1 dram in Armenia | - |
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| lummox | (noun) an awkward stupid person | Synonyms: clod, gawk, goon, lout, lubber, lump, oaf, stumblebum |
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| lump | (noun) a compact mass | Synonyms: ball, chunk, clod, clump, glob |
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| (noun) a large piece of something without definite shape | Synonyms: hunk |
| (noun) an awkward stupid person | Synonyms: clod, gawk, goon, lout, lubber, lummox, oaf, stumblebum |
| (noun) an abnormal protuberance or localized enlargement | Synonyms: puffiness, swelling |
| (verb) group or chunk together in a certain order or place side by side | Synonyms: chunk, collocate |
| (verb) put together indiscriminately | Synonyms: chunk |
| lumpectomy | (noun) surgical removal of a tumor without removing much of the surrounding tissue or lymph nodes; performed in some cases of breast cancer | - |
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| lumpen | (adjective) mentally sluggish | Synonyms: lumpish, unthinking |
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| lumpenproletariat | (noun) (Marxism) the unorganized lower levels of the proletariat who are not interested in revolutionary advancement | - |
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| lumper | (noun) a taxonomist who classifies organisms into large groups on the basis of major characteristics | - |
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| (noun) a laborer who loads and unloads vessels in a port | Synonyms: dock-walloper, dock worker, docker, dockhand, dockworker, loader, longshoreman, stevedore |
| lumpfish | (noun) clumsy soft thick-bodied northern Atlantic fish with pelvic fins fused into a sucker; edible roe used for caviar | Synonyms: Cyclopterus lumpus |
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| lumpiness | (noun) The property of being full of lumps, not being smooth. | - |
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| lumpish | (adjective) mentally sluggish | Synonyms: lumpen, unthinking |
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| lumpsucker | (noun) any of several very small lumpfishes | - |
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| lumpy | (adjective) having lumps; not smooth and even in texture | - |
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| (adjective) like or containing small sticky lumps | Synonyms: chunky |