| lab | (noun) a workplace for the conduct of scientific research | Synonyms: laboratory, research lab, research laboratory, science lab, science laboratory |
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| labdanum | (noun) a soft blackish-brown resinous exudate from various rockroses used in perfumes especially as a fixative | Synonyms: ladanum |
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| (noun) a dark brown to greenish oleoresin that has a fragrant odor and is used as a fixative in perfumes; obtained as a juice from certain rockroses | Synonyms: gum labdanum |
| label | (noun) an identifying or descriptive marker that is attached to an object | - |
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| (noun) a brief description given for purposes of identification | - |
| (noun) trade name of a company that produces musical recordings | Synonyms: recording label |
| (noun) a radioactive isotope that is used in a compound in order to trace the mechanism of a chemical reaction | - |
| (verb) distinguish (an element or atom) by using a radioactive isotope or an isotope of unusual mass for tracing through chemical reactions | - |
| (verb) distinguish (as a compound or molecule) by introducing a labeled atom | - |
| (verb) assign a label to; designate with a label | - |
| (verb) pronounce judgment on | Synonyms: judge, pronounce |
| (verb) attach a tag or label to | Synonyms: mark, tag |
| labeled | (adjective) bearing or marked with a label or tag | Synonyms: labelled, tagged |
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| labelled | (adjective) bearing or marked with a label or tag | Synonyms: labeled, tagged |
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| labetalol | (noun) antihypertensive drug (trade names Trandate and Normodyne) that blocks alpha and beta-adrenergic receptors of the sympathetic nervous system (leading to a decrease in blood pressure) | Synonyms: labetalol hydrochloride, Normodyne, Trandate |
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| labial | (adjective) relating to or near the female labium | - |
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| (adjective) of or relating to the lips of the mouth | - |
| (noun) a consonant whose articulation involves movement of the lips | Synonyms: labial consonant |
| labialise | (verb) pronounce with rounded lips | Synonyms: labialize, round |
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| labialize | (verb) pronounce with rounded lips | Synonyms: labialise, round |
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| labiate | (adjective) having lips or parts that resemble lips | Synonyms: liplike |
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| labile | (adjective) (chemistry, physics, biology) readily undergoing change or breakdown | - |
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| (adjective) liable to change | - |
| labiodental | (noun) a consonant whose articulation involves the lips and teeth | Synonyms: labiodental consonant |
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| labium | (noun) a liplike structure that bounds a bodily orifice (especially any of the four labiate folds of a woman's vulva) | - |
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| labor | (noun) productive work (especially physical work done for wages) | Synonyms: labour, toil |
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| (noun) any piece of work that is undertaken or attempted | Synonyms: labour, project, task, undertaking |
| (noun) a social class comprising those who do manual labor or work for wages | Synonyms: labour, proletariat, working class |
| (noun) an organized attempt by workers to improve their status by united action (particularly via labor unions) or the leaders of this movement | Synonyms: labor movement, labour, trade union movement |
| (noun) concluding state of pregnancy; from the onset of contractions to the birth of a child | Synonyms: childbed, confinement, labour, lying-in, parturiency, travail |
| (verb) undergo the efforts of childbirth | Synonyms: labour |
| (verb) work hard | Synonyms: dig, drudge, fag, grind, labour, moil, toil, travail |
| (verb) strive and make an effort to reach a goal | Synonyms: drive, labour, push, tug |
| laboratory | (noun) a workplace for the conduct of scientific research | Synonyms: lab, research lab, research laboratory, science lab, science laboratory |
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| (noun) a region resembling a laboratory inasmuch as it offers opportunities for observation and practice and experimentation | Synonyms: testing ground |
| labored | (adjective) lacking natural ease | Synonyms: laboured, strained |
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| (adjective) requiring or showing effort | Synonyms: heavy, laboured |
| laborer | (noun) someone who works with their hands; someone engaged in manual labor | Synonyms: jack, labourer, manual laborer |
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| laboring | (adjective) doing arduous or unpleasant work | Synonyms: drudging, labouring, toiling |
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| laborious | (adjective) characterized by effort to the point of exhaustion; especially physical effort | Synonyms: arduous, backbreaking, grueling, gruelling, hard, heavy, operose, punishing, toilsome |
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| laboriously | (adverb) in a laborious manner | - |
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| laboriousness | (noun) the quality of requiring extended effort | Synonyms: operoseness, toilsomeness |
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| laborsaving | (adjective) designed to replace or conserve human and especially manual labor | Synonyms: laboursaving |
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| labour | (noun) productive work (especially physical work done for wages) | Synonyms: labor, toil |
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| (noun) any piece of work that is undertaken or attempted | Synonyms: labor, project, task, undertaking |
| (noun) a social class comprising those who do manual labor or work for wages | Synonyms: labor, proletariat, working class |
| (noun) an organized attempt by workers to improve their status by united action (particularly via labor unions) or the leaders of this movement | Synonyms: labor, labor movement, trade union movement |
| (noun) concluding state of pregnancy; from the onset of contractions to the birth of a child | Synonyms: childbed, confinement, labor, lying-in, parturiency, travail |
| (verb) undergo the efforts of childbirth | Synonyms: labor |
| (verb) work hard | Synonyms: dig, drudge, fag, grind, labor, moil, toil, travail |
| (verb) strive and make an effort to reach a goal | Synonyms: drive, labor, push, tug |
| laboured | (adjective) lacking natural ease | Synonyms: labored, strained |
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| (adjective) requiring or showing effort | Synonyms: heavy, labored |
| labourer | (noun) someone who works with their hands; someone engaged in manual labor | Synonyms: jack, laborer, manual laborer |
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| labouring | (adjective) doing arduous or unpleasant work | Synonyms: drudging, laboring, toiling |
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| laboursaving | (adjective) designed to replace or conserve human and especially manual labor | Synonyms: laborsaving |
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| labrocyte | (noun) a large connective tissue cell that contains histamine and heparin and serotonin which are released in allergic reactions or in response to injury or inflammation | Synonyms: mast cell, mastocyte |
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| labyrinth | (noun) complex system of paths or tunnels in which it is easy to get lost | Synonyms: maze |
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| (noun) a complex system of interconnecting cavities; concerned with hearing and equilibrium | Synonyms: inner ear, internal ear |
| labyrinthian | (adjective) resembling a labyrinth in form or complexity | Synonyms: labyrinthine, mazy |
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| labyrinthine | (adjective) relating to or affecting or originating in the inner ear | - |
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| (adjective) resembling a labyrinth in form or complexity | Synonyms: labyrinthian, mazy |
| (adjective) highly complex or intricate and occasionally devious | Synonyms: Byzantine, convoluted, involved, knotty, tangled, tortuous |
| labyrinthitis | (noun) inflammation of the inner ear; can cause vertigo and vomiting | Synonyms: otitis interna |
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| labyrinthodont | (noun) an amphibian of the superorder Labyrinthodontia | - |
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