(Encyclopedia) LepidodendronLepidodendronlĕpˌĭdōdĕnˈdrən [key] and SigillariaSigillariasĭjĭlârˈēə [key], two principal genera of an extinct group of primitive vascular trees. They dominated the…
(Encyclopedia) LepidusLepiduslĕpˈĭdəs [key], family of the ancient Roman patrician gens Aemilia. Marcus Aemilius Lepidus, d. 152 b.c., was a consul in 187 and 175 b.c., a censor in 179 b.c., and…
(Encyclopedia) Le Play, Pierre Guillaume FrédéricLe Play, Pierre Guillaume Frédéricpyĕr gēyōmˈ frādārēkˈ lə plā [key], 1806–82, French sociologist and economist. As an engineer he traveled through…
(Encyclopedia) Leppard, Raymond John, 1927–2019, English-American conductor, composer, musicologist, and harpsicordist, b. London. A prominent scholar as well as a conductor, he was especially known…
(Encyclopedia) leprechaunleprechaunlĕpˈrəkŏn [key], Irish fairy represented as a tiny old man. Leprechauns are mischievous and elusive creatures, said to possess buried crocks of gold, the location…
(Encyclopedia) leprosy or Hansen's diseaseHansen's diseasehănˈsənz [key], chronic, mildly infectious malady capable of producing, when untreated, various deformities and disfigurements. It is caused…
(Encyclopedia) Lepsius, Karl RichardLepsius, Karl Richardrĭkhˈärt lĕpˈsē&oobreve;s [key], 1810–84, German Egyptologist and philologist. He made an expedition (1842–45) to the Nile valley and…
(Encyclopedia) LeptisLeptislĕpˈtĭs [key], ancient city of Libya, E of Tripoli. It was founded (c.600 b.c.) by Phoenicians from Sidon. Annexed (46 b.c.) to the Roman province of Africa, it flourished…
(Encyclopedia) leptonleptonlĕpˈtŏnˌ [key] [Gr.,=light (i.e., lightweight)], class of elementary particles that includes the electron and its antiparticle, the muon and its antiparticle, the tau and…
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