Etymology
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*nas- 
Proto-Indo-European root meaning "nose."

It forms all or part of: nares; nark; nasal; nasopharynx; nasturtium; ness; nose; nostril; nozzle; nuzzle; pince-nez.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit nasa, Old Persian naham, Latin nasus, Old Church Slavonic nasu, Lithuanian nosis, Old English nosu, German Nase "nose."
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*nau- 
nāu-, Proto-Indo-European root meaning "boat."

It forms all or part of: aeronautics; aquanaut; Argonaut; astronaut; cosmonaut; nacelle; naval; nave (n.1) "main part of a church;" navicular; navigate; navigation; navy; naufragous; nausea; nautical; nautilus; noise.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit nauh, accusative navam "ship, boat;" Armenian nav "ship;" Greek naus "ship," nautes "sailor;" Latin navis "ship;" Old Irish nau "ship," Welsh noe "a flat vessel;" Old Norse nor "ship."
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*ne- 
Proto-Indo-European root meaning "not."

It forms all or part of: a- (3) "not, without;" abnegate; ahimsa; an- (1) privative prefix; annihilate; annul; aught (n.2) "zero, nothing;" deny; hobnob; in- (1) "not, opposite of, without;" ixnay; naught; naughty; nay; nefarious; negate; neglect; negligee; negotiate; neither; nepenthe; nescience; nescient; neuter; never; nice; nihilism; nihility; nil; nill; nimiety; nix; no; non-; none; nonplus; nor; not; nothing; null; nullify; nulliparous; renegade; renege; un- (1) prefix of negation; willy-nilly.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit a-, an- "not;" Avestan na "not;" Greek a-, an-, ne- "not;" Latin in- "not," ne "that not;" Old Church Slavonic and Lithuanian ne "not;" Old Irish an-, ni, Cornish ny "not;" Gothic and Old English un- "not."
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*nebh- 
Proto-Indo-European root meaning "cloud."

It forms all or part of: nebula; nebular; nebulosity; nebulous; Neptune; Nibelungenlied; Niflheim; nimbus.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit nabhas- "vapor, cloud, mists, fog, sky;" Greek nephele, nephos "cloud;" Latin nebula "mist, vapor, fog, smoke, exhalation;" German Nebel "fog;" Old English nifol "dark, gloomy;" Welsh niwl "cloud, fog;" Slavic nebo.
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*ned- 
Proto-Indo-European root meaning "to bind, tie."

It forms all or part of: annex; annexation; connect; connection; denouement; net (n.) "netting, network, mesh used for capturing;" nettle; nexus; node; nodule; noose.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit nahyati "binds, ties;" Latin nodus "knot;" Old Irish nascim "I bind, oblige;" Old English net "netting, network."
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*nek- (1)
Proto-Indo-European root meaning "death." It forms all or part of: innocent; innocuous; internecine; necro-; necropolis; necrosis; necromancy; nectar; nectarine; nociceptive; nocuous; noxious; nuisance; obnoxious; pernicious.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit nasyati "disappears, perishes," Avestan nasyeiti "disappears," nasu- "corpse," Old Persian vi-nathayatiy "he injures;" Greek nekros "corpse;" Latin nex, genitive necis "violent death, murder" (as opposed to mors), nocere "to harm, hurt," noxius "harmful;" Greek nekus "dead" (adj.), nekros "dead body, corpse;" Old Irish ec, Breton ankou, Welsh angeu "death."
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*nem- 
Proto-Indo-European root meaning "assign, allot; take."

It forms all or part of: agronomy; anomie; anomy; antinomian; antinomy; astronomer; astronomy; autonomous; autonomy; benumb; Deuteronomy; economy; enumerate; enumeration; gastronomy; heteronomy; innumerable; metronome; namaste; nemesis; nimble; nim; nomad; nomothetic; numb; numeracy; numeral; numerator; numerical; numerology; numerous; numismatic; supernumerary; taxonomy.

It is the hypothetical source of/evidence for its existence is provided by: Greek nemein "to deal out," nemesis "just indignation;" Latin numerus "number;" Lithuanian nuoma "rent, interest;" Middle Irish nos "custom, usage;" German nehmen "to take."
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*ner- (2)

Proto-Indo-European root meaning "man," also "vigorous, vital, strong."

It forms all or part of: Alexander; Andrew; andro-; androgynous; android; Andromache; Andromeda; andron; anthropo-; anthropocentric; anthropology; anthropomorphous; Leander; lycanthropy; Lysander; misanthrope; pachysandra; philander; philanthropy; polyandria; polyandrous.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit nar-, Armenian ayr, Welsh ner "a man;" Greek aner (genitive andros) "a man, a male" (as opposed to a woman, a youth, or a god).

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*neu- 
Proto-Indo-European root meaning "to shout." It forms all or part of: announce; denounce; enunciate; nuncio; pronounce; renounce.

It is the hypothetical source of/evidence for its existence is provided by: Greek neuo "to nod, beckon," Latin nuntius "messenger," Old Irish noid "make known."
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*no-men- 

Proto-Indo-European root meaning "name."

It forms all or part of: acronym; allonym; ananym; anonymous; antonomasia; antonym; binomial; caconym; cognomen; denominate; eponym; eponymous; heteronym; homonym; homonymous; hyponymy; ignominious; ignominy; innominable; Jerome; matronymic; metonymy; metronymic; misnomer; moniker; name; nomenclature; nominal; nominate; noun; onomastic; onomatopoeia; paronomasia; paronym; patronym; patronymic; praenomen; pronoun; pseudonym; renown; synonym; synonymy; synonymous; toponym.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit nama; Avestan nama; Greek onoma, onyma; Latin nomen; Old Church Slavonic ime, genitive imene; Russian imya; Old Irish ainm; Old Welsh anu "name;" Old English nama, noma, Old High German namo, Old Norse nafn, Gothic namo "name."

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