lumber (n.)youdaoicibaDictYouDict[lumber 词源字典]
"timber sawn into rough planks," 1660s, American English (Massachusetts), earlier "disused bit of furniture; heavy, useless objects" (1550s), probably from lumber (v.), perhaps influenced by Lombard, from the Italian immigrants famous as pawnbrokers and money-lenders in England (see Lombard). Lumbar, Lumbard were old alternative forms of Lombard in English. The evolution of sense then would be because a lumber-house ("pawn shop") naturally accumulates odds and ends of furniture.
Live Lumber, soldiers or passengers on board a ship are so called by the sailors. [Grose, "Dictionary of the Vulgar Tongue," 1785]



LUMBER HOUSE. A house appropriated by thieves for the reception of their stolen property. ["Dictionary of Buckish Slang, University Wit, and Pickpocket Eloquence," London, 1811]
[lumber etymology, lumber origin, 英语词源]
lumber (v.)youdaoicibaDictYouDict
"to move clumsily," c. 1300, lomere, probably from a Scandinavian source (compare dialectal Swedish loma "move slowly, walk heavily," Old Norse lami "lame"), ultimately cognate with lame (adj.). Related: Lumbered; lumbering.
lumberjack (n.)youdaoicibaDictYouDict
1831, Canadian English, from lumber (n.) + Jack.
lumbo-youdaoicibaDictYouDict
word-forming element meaning "loin, loins," from comb. form of Latin lumbus (see lumbago).
lumen (n.)youdaoicibaDictYouDict
unit of luminosity, 1897, coined 1894 by French physicist André-Eugène Blondel (1863-1938) from Latin lumen "light," related to lucere "to shine" (see light (n.)).
LumiereyoudaoicibaDictYouDict
in reference to the early color photography process, from the names of French brothers Auguste (1862-1954) and Louis (1864-1948) Lumière, photographers. The name is literally "light, lamp."
luminaire (n.)youdaoicibaDictYouDict
electric light, 1921, from French luminaire, from Old French luminarie (see luminary).
Luminal (n.)youdaoicibaDictYouDict
trade name of phenobarbitone, used as a sedative and hypnotic, coined 1912 in German from Latin lumen "light," related to lucere "to shine" (see light (n.)), + -al (3), "the root here being used, very irregularly, as an equivalent of pheno- [Flood].
luminal (adj.)youdaoicibaDictYouDict
"of or pertaining to a lumen," 1897, with -al (1).
luminance (n.)youdaoicibaDictYouDict
"luminousness," 1862, from Latin luminantem (nominative luminans), present participle of luminare (see luminary).
luminary (n.)youdaoicibaDictYouDict
mid-15c., "lamp, source of (artificial) light," from Old French luminarie (12c.), "lamp, lights, lighting; candles; brightness, illumination," from Late Latin luminare "light, torch, lamp, heavenly body," literally "that which gives light," from Latin lumen (genitive luminis) "light," related to lucere "to shine" (see light (n.)). Sense of "notable person" is first recorded 1690s, though the Middle English word also had a figurative sense of "source of spiritual light, example of holiness."
luminate (v.)youdaoicibaDictYouDict
1620s (now obsolete), from Latin luminatus, past participle of luminare (see luminary). Related: Luminated; luminating.
luminescence (n.)youdaoicibaDictYouDict
1884, from Latin lumen (genitive luminis) "light" (see luminous) + -escence.
Fluorescence and Phosphorescence -- Prof. E. Wiedmann has made a new study of these phenomena. He proposes the general name luminescence for evolutions of light which do not depend on the temperature of the substance concerned. ["Photographic News," April 20, 1888]
luminescentyoudaoicibaDictYouDict
1889, from luminescence + -ent.
luminosity (n.)youdaoicibaDictYouDict
1630s, "quality of being luminous," from French luminosité or else a native formation from luminous + -ity. In astronomy, "intrinsic brightness of a heavenly body" (as distinguished from apparent magnitude, which diminishes with distance), attested from 1906.
luminous (adj.)youdaoicibaDictYouDict
early 15c., "full of light," from Latin luminosus "shining, full of light," from lumen (genitive luminis) "light," related to lucere "to shine" (see light (n.)). Related: Luminously.
lummox (n.)youdaoicibaDictYouDict
1825, East Anglian slang, perhaps from dumb ox, influenced by lumbering; or from E. Anglian dialectal form of verb lummock "move heavily or clumsily," of uncertain origin.
lump (n.)youdaoicibaDictYouDict
early 14c., lumpe (1224 as surname), probably in Old English, perhaps from a Scandinavian source (compare Danish lumpe, 16c.), of unknown origin. Compare also Middle High German lumpe, early modern Dutch lompe. Phrase lump in (one's) throat "feeling of tightness brought on by emotion" is from 1803. Lumps "hard knocks, a beating" is colloquial, from 1934. Lump sum, one covering a number of items, is from 1867.
lump (v.2)youdaoicibaDictYouDict
"endure" (now usually in contrast to like), 1791, apparently an extended sense from an older meaning "to look sulky, dislike" (1570s), of unknown origin, perhaps a symbolic sound (compare grump, harumph, etc.). Related: Lumped; lumping.
LUMPING. Great. A lumping pennyworth; a great qualtity for the money, a bargain. He has got a lumping pennyworth; frequently said of a man who marries a fat woman. [Grose, "Classical Dictionary of the Vulgar Tongue," 3rd edition, 1796]
lump (v.1)youdaoicibaDictYouDict
early 15c., "to curl up in a ball, to gather into a lump" (implied in lumped), from lump (n.). Meaning "to put together in one mass or group" is from 1620s. Related: Lumped; lumping.