| lycaenid | (noun) any of various butterflies of the family Lycaenidae | Synonyms: lycaenid butterfly |
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| lycanthrope | (noun) a monster able to change appearance from human to wolf and back again | Synonyms: loup-garou, werewolf, wolfman |
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| lycanthropy | (noun) (folklore) the magical ability of a person to assume the characteristics of a wolf | - |
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| lycee | (noun) a school for students intermediate between elementary school and college; usually grades 9 to 12 | Synonyms: Gymnasium, lyceum, middle school, secondary school |
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| lyceum | (noun) a public hall for lectures and concerts | - |
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| (noun) a school for students intermediate between elementary school and college; usually grades 9 to 12 | Synonyms: Gymnasium, lycee, middle school, secondary school |
| lychee | (noun) Chinese fruit having a thin brittle shell enclosing a sweet jellylike pulp and a single seed; often dried | Synonyms: leechee, lichee, lichi, litchee, litchi, litchi nut |
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| lychgate | (noun) a roofed gate to a churchyard, formerly used as a temporary shelter for the bier during funerals | Synonyms: lichgate |
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| lychnis | (noun) mostly perennial herbs with sticky stems that catch insects; widespread in north temperate zone | Synonyms: catchfly |
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| lycopene | (noun) carotenoid that makes tomatoes red; may lower the risk of prostate cancer | - |
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| lycopod | (noun) primitive evergreen moss-like plant with spores in club-shaped strobiles | Synonyms: club-moss, club moss |
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| lye | (noun) a strong solution of sodium or potassium hydroxide | - |
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| lygaeid | (noun) a true bug: usually bright-colored; pest of cultivated crops and some fruit trees | Synonyms: lygaeid bug |
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| lying | (noun) the deliberate act of deviating from the truth | Synonyms: fabrication, prevarication |
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| lymantriid | (noun) dull-colored moth whose larvae have tufts of hair on the body and feed on the leaves of many deciduous trees | Synonyms: tussock moth |
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| lymph | (noun) a thin coagulable fluid (similar to plasma but) containing white blood cells (lymphocytes) and chyle; is conveyed to the blood stream by lymphatic vessels | - |
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| lymphadenitis | (noun) inflammation of lymph nodes | - |
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| lymphadenoma | (noun) an abnormally enlarged lymph node | - |
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| lymphadenopathy | (noun) chronic abnormal enlargement of the lymph nodes (usually associated with disease) | - |
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| lymphangiectasia | (noun) dilatation of a lymph vessel | Synonyms: lymphangiectasis |
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| lymphangiectasis | (noun) dilatation of a lymph vessel | Synonyms: lymphangiectasia |
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| lymphangiogram | (noun) an angiogram of the lymph nodes and lymph vessels made after the injection of a radiopaque substance | - |
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| lymphangiography | (noun) roentgenographic examination of lymph nodes and lymph vessels after injection of a radiopaque contrast medium; produces a lymphangiogram | Synonyms: lymphography |
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| lymphangioma | (noun) benign angioma consisting of a mass of lymphatic vessels | - |
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| lymphangitis | (noun) inflammation of a lymph vessel | - |
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| lymphedema | (noun) swelling (usually in the legs) caused by lymph accumulating in the tissues in the affected areas | - |
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| lymphoblast | (noun) an immature lymphocyte | - |
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| lymphocyte | (noun) an agranulocytic leukocyte that normally makes up a quarter of the white blood cell count but increases in the presence of infection | Synonyms: lymph cell |
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| lymphocytopenia | (noun) an abnormally small number of lymphocytes in the circulating blood | Synonyms: lymphopenia |
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| lymphocytosis | (noun) an abnormal increase in the number of lymphocytes in the circulating blood | - |
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| lymphogranuloma | (noun) swelling of a lymph node | - |
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| lymphography | (noun) roentgenographic examination of lymph nodes and lymph vessels after injection of a radiopaque contrast medium; produces a lymphangiogram | Synonyms: lymphangiography |
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| lymphokine | (noun) a cytokine secreted by helper T cells in response to stimulation by antigens and that acts on other cells of the immune system (as by activating macrophages) | - |
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| lymphoma | (noun) a neoplasm of lymph tissue that is usually malignant; one of the four major types of cancer | - |
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| lymphopenia | (noun) an abnormally small number of lymphocytes in the circulating blood | Synonyms: lymphocytopenia |
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| lymphopoiesis | (noun) the formation of lymphocytes in the bone marrow and lymph nodes and thymus and spleen | - |
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| lymphuria | (noun) the presence of lymph in the urine | - |
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| lynching | (noun) putting a person to death by mob action without due process of law | - |
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| lynchpin | (noun) pin inserted through an axletree to hold a wheel on | Synonyms: linchpin |
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| (noun) a central cohesive source of support and stability | Synonyms: anchor, backbone, keystone, linchpin, mainstay |
| lynx | (noun) short-tailed wildcats with usually tufted ears; valued for their fur | Synonyms: catamount |
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| (noun) a text browser | - |
| lyophilisation | (noun) a method of drying food or blood plasma or pharmaceuticals or tissue without destroying their physical structure; material is frozen and then warmed in a vacuum so that the ice sublimes | Synonyms: freeze-drying, lyophilization |
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| lyophilization | (noun) a method of drying food or blood plasma or pharmaceuticals or tissue without destroying their physical structure; material is frozen and then warmed in a vacuum so that the ice sublimes | Synonyms: freeze-drying, lyophilisation |
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| lypressin | (noun) an antidiuretic and vasoconstrictor used to treat diabetes insipidus | - |
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| lyre | (noun) a harp used by ancient Greeks for accompaniment | - |
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| lyrebird | (noun) Australian bird that resembles a pheasant; the courting male displays long tail feathers in a lyre shape | - |
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| lyreflower | (noun) garden plant having deep-pink drooping heart-shaped flowers | Synonyms: bleeding heart, Dicentra spectabilis, lyre-flower |
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| lyric | (noun) a short poem of songlike quality | Synonyms: lyric poem |
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| (noun) the text of a popular song or musical-comedy number | Synonyms: language, words |
| lyricality | (noun) the property of being suitable for singing | Synonyms: lyricism, songfulness |
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| lyricism | (noun) the property of being suitable for singing | Synonyms: lyricality, songfulness |
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| (noun) unrestrained and exaggerated enthusiasm | - |
| lyricist | (noun) a person who writes the words for songs | Synonyms: lyrist |
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| lyrist | (noun) a person who writes the words for songs | Synonyms: lyricist |
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| lysin | (noun) any substance (such as an antibody) or agent that can cause lysis | - |
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| lysine | (noun) an essential amino acid found in proteins; occurs especially in gelatin and casein | - |
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| lysinemia | (noun) an inborn error of metabolism in which the lack of certain enzymes leads to an inability to metabolize the amino acid lysine; characterized by muscular weakness and mental retardation | - |
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| lysis | (noun) (biochemistry) dissolution or destruction of cells such as blood cells or bacteria | - |
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| (noun) recuperation in which the symptoms of an acute disease gradually subside | - |
| lysogenicity | (noun) the condition of a host bacterium that has incorporated a phage into its own genetic material | Synonyms: lysogeny |
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| lysogenisation | (noun) the process by which a bacterium acquires a phage that becomes integrated into its genome | Synonyms: lysogenization |
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| lysogenization | (noun) the process by which a bacterium acquires a phage that becomes integrated into its genome | Synonyms: lysogenisation |
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| lysogeny | (noun) the condition of a host bacterium that has incorporated a phage into its own genetic material | Synonyms: lysogenicity |
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| lysosome | (noun) an organelle found in the cytoplasm of most cells (especially in leukocytes and liver and kidney cells) | - |
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| lysozyme | (noun) an enzyme found in saliva and sweat and tears that destroys the cell walls of certain bacteria | Synonyms: muramidase |
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| lyssa | (noun) an acute viral disease of the nervous system of warm-blooded animals (usually transmitted by the bite of a rabid animal); rabies is fatal if the virus reaches the brain | Synonyms: hydrophobia, madness, rabies |
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| lyssavirus | (noun) a neurotropic non-arbovirus of the family Rhabdoviridae that causes rabies | - |
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