Etymology
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potamo- 

word-forming element meaning "river," from Greek potamos "river," perhaps literally "rushing water," from PIE root *pet- "to rush, to fly."

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ptero- 

before vowels pter-, word-forming element in science meaning "feather; wing," from Greek pteron "wing," from PIE *pt-ero- (source also of Sanskrit patram "wing, feather," Old Church Slavonic pero "pen," Old Norse fjöðr, Old English feðer), from root *pet- "to rush; to fly."

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