Etymology
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*magh- 

Proto-Indo-European root meaning "to be able, have power." It forms all or part of: dismay; deus ex machina; may (v.1) "am able;" might (n.) "bodily strength, power;" main; machine; mechanic; mechanism; mechano-; mage; magi; magic.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit mahan "great;" Greek mēkhanē "device, means," mekhos, makhos "means, instrument;" Old Church Slavonic mošti, Russian moč' "can, be able;" Old English mæg "I can," Gothic mag "can, is able," Old High German magan, Old Norse magn "power, might."

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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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*po(i)- 
*pō(i)-, Proto-Indo-European root meaning "to drink."

It forms all or part of: beer; bever; beverage; bib; bibitory; bibulous; hibachi; imbibe; imbrue; pinocytosis; pirogi; poison; potable; potation; potion; symposium.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit pati "drinks," panam "beverage;" Greek pinein "to drink," poton "that which one drinks," potos "drinking bout;" Latin potare "to drink," potio "a potion, a drinking," also "poisonous draught, magic potion;" Old Church Slavonic piti "to drink," pivo "beverage."
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