Etymology
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*men- (3)

Proto-Indo-European root meaning "to remain." It forms all or part of: maisonette; manor; manse; mansion; menage; menial; immanent; permanent; remain; remainder.

It is the hypothetical source of/evidence for its existence is provided by: Persian mandan "to remain;" Greek menein "to remain;" Latin manere "to stay, abide."

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*ater- 
*āter-, Proto-Indo-European root meaning "fire." It forms all or part of: atrabiliary; atrabilious; atrium; atrocious.

It is the hypothetical source of/evidence for its existence is provided by: Old Persian atar "fire;" Latin ater "black" ("blackened by fire"), atrox "frightful" ("of fiery or threatening appearance").
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*mel- (2)

Proto-Indo-European root meaning "strong, great." It forms all or part of: ameliorate; amelioration; meliorate; melioration; meliorism; multi-; multiform; multiple; multiply; multitude. It is the hypothetical source of/evidence for its existence is provided by: Greek mala "very, very much;" Latin multus "much, many," melior "better."  

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*ghes- 

Proto-Indo-European root meaning "the hand." 

It forms all or part of: chiral; chiro-; chirognomy; chirography; chirology; chiromancy; chiropodist; chiropractic; chiropractor; chirosophy; chirurgeon; enchiridion; surgeon; surgery; surgical.

It is the hypothetical source of/evidence for its existence is provided by: Greek kheir, Hittite keshshar, Armenian jern "the hand" 

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*keg- 
Proto-Indo-European root meaning "hook, tooth."

It forms all or part of: hacek; hack (v.1) "to cut roughly, cut with chopping blows;" hake; Hakenkreuz; heckle; hook; hooker.

It is the hypothetical source of/evidence for its existence is provided by: Russian kogot "claw;" Old English hoc "hook, angle."
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*bhereg- 

*bherəg-, Proto-Indo-European root meaning "to shine; bright, white." It forms all or part of: Albert; Bertha; birch; bright; Egbert; Ethelbert; Gilbert; Herbert; Hubert; Lambert; Robert.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit bhrajate "shines, glitters;" Lithuanian brėkšti "to dawn;" Welsh berth "bright, beautiful."

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*mak- 

*māk-, Proto-Indo-European root meaning "long, thin." It forms all or part of: emaciate; macro; macro-; macrobiotic; macron; meager; paramecium. It is the hypothetical source of/evidence for its existence is provided by: Greek makros "long, large," mēkos "length;" Latin macer "lean, thin;" Old Norse magr, Old English mæger "lean, thin."

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*er- (2)
Proto-Indo-European root meaning "earth, ground." It forms all or part of: aardvark; aardwolf; earth; earthen; earthy.

It is the hypothetical source of/evidence for its existence is provided by: Old English eorþe "ground, soil, dirt, dry land," Old Norse jörð, Old High German erda, Gothic airþa; Middle Irish -ert "earth."
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*aim- 

Proto-Indo-European root meaning "to copy." 

It forms all or part of: emulate; emulation; emulous;  image; imaginary; imagination; imaginative; imagine; imago; imitable; imitate; imitative; imitator; inimitable.

It is the hypothetical source of/evidence for its existence is provided by: Latin imago "image," aemulus "emulous," imitari "to copy, portray, imitate;" Hittite himma- "imitation, substitute."

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*ghel- (1)

Proto-Indo-European root meaning "to call." 

It forms all or part of: nightingale; yell; yelp

It is the hypothetical source of/evidence for its existence is provided by: Greek kikhle "thrush," also a kind of fish, khelidon "the swallow;" Lithuanian gulbinti "to praise;" Old English galan "to sing," galdor "spell, charm, magic, enchantment," giellan "to yell," gielpan "to boast."  

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