| leptocephalus | (noun) slender transparent larva of eels and certain fishes | - |
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| leptodactylid | (noun) toothed frogs: terrestrial or aquatic or arboreal | Synonyms: leptodactylid frog |
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| leptomeninges | (noun) the two innermost layers of the meninges; cerebrospinal fluid circulates between these innermost layers | - |
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| leptomeningitis | (noun) inflammation of the leptomeninges | - |
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| lepton | (noun) an elementary particle that participates in weak interactions; has a baryon number of 0 | - |
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| (noun) 100 lepta equal 1 drachma in Greece | - |
| leptospira | (noun) important pathogens causing Weil's disease or canicola fever | - |
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| leptospirosis | (noun) an infectious disease cause by leptospira and transmitted to humans from domestic animals; characterized by jaundice and fever | Synonyms: swamp fever |
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| leptosporangium | (noun) a sporangium formed from a single epidermal cell; characteristic of the Filicales or of almost all modern ferns | - |
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| leptotene | (noun) the first stage of the prophase of meiosis | - |
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