Etymology
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*lois- 

Proto-Indo-European root meaning "furrow, track." 

It forms all or part of: delirious; delirium; last (n.1) "wooden model of a human foot used by shoemakers;" last (v.) "endure, go on existing;" learn; learning; Lehrjahre; lore.

It is the hypothetical source of/evidence for its existence is provided by: Latin lira "furrow;" Old Prussian lyso "field bed;" Old Church Slavonic lexa "field bed, furrow;" Old High German leisa "track," Gothic laistjan "to follow," Old English læran "to teach."

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*legh- 

Proto-Indo-European root meaning "to lie down, lay."

It forms all or part of: allay; anlage; belay; beleaguer; bylaw; coverlet; fellow; lager; lair; law; lawful; lawless; lawsuit; lawyer; lay (v.) "to cause to lie or rest;" ledge; ledger; lees; lie (v.2) "rest horizontally;" litter; lochia; low (adj.) "not high;" outlaw; scofflaw; stalag; vorlage.

It is the hypothetical source of/evidence for its existence is provided by: Hittite laggari "falls, lies;" Greek lekhesthai "to lie down," legos "bed," lokhos "lying in wait, ambush," alokhos "bedfellow, wife;" Latin lectus "bed;" Old Church Slavonic lego "to lie down;" Lithuanian at-lagai "fallow land;" Old Irish laigim "I lie down," Irish luighe "couch, grave;" Old English licgan "be situated, have a specific position; remain; be at rest, lie down."

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*kei- (1)

Proto-Indo-European root meaning "to lie," also forming words for "bed, couch," and with a secondary sense of "beloved, dear."

It forms all or part of: ceilidh; cemetery; city; civic; civil; civilian; civilization; civilize; hide (n.2) measure of land; incivility; incunabula; Siva.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit Sivah "propitious, gracious;" Greek keisthai "to lie, lie asleep;" Latin cunae "a cradle;" Old Church Slavonic semija "family, domestic servants;" Lithuanian šeima "domestic servants," Lettish sieva "wife;" Old English hiwan "members of a household."

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