| lecanopteris | (noun) any of several bizarre ferns of the genus Lecanopteris having swollen hollow rhizomes that provide homes for symbiotic ants | - |
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| lecanora | (noun) any lichen of the genus Lecanora; some used in dyeing; some used for food | - |
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| lech | (noun) man with strong sexual desires | Synonyms: lecher, letch, satyr |
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| lechatelierite | (noun) colorless glass made of almost pure silica | Synonyms: crystal, quartz, quartz glass, vitreous silica |
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| lecher | (noun) man with strong sexual desires | Synonyms: lech, letch, satyr |
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| lecherousness | (noun) a strong sexual desire | Synonyms: lust, lustfulness |
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| lechery | (noun) unrestrained indulgence in sexual activity | - |
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| lechwe | (noun) tawny-colored African antelope inhabiting wet grassy plains; a threatened species | Synonyms: Kobus leche |
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| lecithin | (noun) a yellow phospholipid essential for the metabolism of fats; found in egg yolk and in many plant and animal cells; used commercially as an emulsifier | - |
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| lectern | (noun) desk or stand with a slanted top used to hold a text at the proper height for a lecturer | Synonyms: reading desk |
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| lectin | (noun) any of several plant glycoproteins that act like specific antibodies but are not antibodies in that they are not evoked by an antigenic stimulus | - |
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| lector | (noun) a public lecturer at certain universities | Synonyms: lecturer, reader |
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| (noun) someone who reads the lessons in a church service; someone ordained in a minor order of the Roman Catholic Church | Synonyms: reader |
| lecture | (noun) teaching by giving a discourse on some subject (typically to a class) | Synonyms: lecturing |
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| (noun) a speech that is open to the public | Synonyms: public lecture, talk |
| (noun) a lengthy rebuke | Synonyms: speech, talking to |
| lecturer | (noun) someone who lectures professionally | - |
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| (noun) a public lecturer at certain universities | Synonyms: lector, reader |
| lectureship | (noun) the post of lecturer | - |
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| lecturing | (noun) teaching by giving a discourse on some subject (typically to a class) | Synonyms: lecture |
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