| lapstone | n. | stone placed in lap against which shoemaker beat and stretched leather | archaic | |
| lapstrake | adj. | clinker-built, having a hull with overlapping planks; a vessel built thusly | nautical | |
| lapwing | n. | large plover | ||
| largophone | n. | musical instrument made of a long wooden pole with jingles attached, played by shaking or pounding or with another smaller notched stick (also lagerphone) | ||
| larrikin | n. | (Australian) hooligan, (usu. young) street tough | ||
| larrup | v. | to flog, beat, thrash | ||
| LAT relationship | n. | “Living Alone Together”, of couples in long-term relationships who still maintain separate residences and often lives apart from one another | idiom | |
| latitudinarian | adj. | tolerant, allowing great latitude in attitude (esp. of religious principles); lax, lacking necessary rigidity in views | ||
| laund | n. | glade, grassy pasture amidst woods | ||
| lavalier | n. | (also lavaliere) jeweled pendant worn on chain around the neck | ||
| laver | n. | basin for washing, as of hands; baptismal font | ||
| lawn | n. | fine linen fabric | ||
| lawny | adj. | covered in grass | ||
| lazarette | n. | hospital for contagious patients, esp. lepers; glory hole, storeroom aboard ship set within the hull | ||
| lazarine | adj. | back from the dead; of or related to a specific type of ulcerating leprosy | ||
| lazaroidal | adj. | of or related to lepers | ||
| lazzarone | n. | beggar, wretched person; member of poorer class in Naples | ||
| leach | v. | to lose soluble components through percolation | ||
| league | n. | unit of distance of varying measure in different places or times, usu. calculated as roughly 3 miles | ||
| leaguer | n. | siege; one who besieges | ||
| leat | n. | open watercourse dug to provide water for mill or mine, etc. | ||
| leather gun | n. | early light cannon of the 1640s & 1650s, where toughened leather wrappings were placed around the more portable smaller barrel in an attempt to give it stability | ||
| leery | adj. | suspicious, wary | ||
| left-footed | adj. | Catholic, esp. an Irish Catholic, from supposed use of poor Irishmen of single-sided spades for digging | slang | |
| legendry | n. | legends in a collective sense, mythologies | ||
| legicentric | adj. | organized around and dedicated to the supremacy of statutes and the law | ||
| leitmotif | n. | (music) theme associated with particular person, idea, or situation | ||
| leman | n. | lover; mistress | archaic | |
| lemniscus | n. | bundle of white nerve fibers in brainstem | ||
| lenify | v. | to soothe; to soften | ||
| lenity | n. | mildness, mercifulness; instance of mercifulness or gentleness | ||
| leper’s squint | n. | opening through external wall of church through which lepers could view religious services | ||
| lèse-majesté | n. | crime against dignity of the sovereign or the state, treason; offense against established order | ||
| leukophorytocracy | n. | rule or government by white trash | ||
| leveret | n. | young hare; pet, mistress | ||
| levin | n. | lightning, bright flash of light | archaic | |
| lex talionis | n. | legal principle that the punishment should be commensurate to the crime | Latin | |
| lexeme | n. | basic lexical unit, which may appear in actual language in different forms due to inflection, tense, number, etc. | ||
| liberty bodice | n. | sleeveless bodice originally created as a less constrictive alternative to corsets | ||
| libration | n. | oscillatory motion, as of a scale at point of balance or the apparent movement of a heavenly body | ||
| lich gate | n. | small roofed gate to a churchyard | ||
| lickerish | adj. | overfond of eating, greedy; lecherous, wanton | ||
| lido | n. | public outdoor swimming pool; beach allocated for swimmers | British | |
| ligate | v. | to tie up, to bind with a ligature | ||
| ligyrophobia | n. | fear of loud noises | ||
| limber | n. | second pair of wheels on an axle behind which a field gun or caisson is hauled | ||
| limen | n. | threshold of perception or response | ||
| limn | v. | to draw, to depict; to describe, to delineate | ||
| limonite | n. | hydrous iron oxide | ||
| limpid | adj. | clear |