Etymology
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mandolin (n.)

"lute-like musical instrument with four to six single or double metallic strings stretched over an almond-shaped body and fretted neck," 1707, from French mandoline, from Italian mandolino, diminutive of mandola, a larger kind of mandolin, altered from Late Latin pandura "three-stringed lute," from Greek pandoura, a three-stringed musical instrument, which is of unknown origin but probably foreign. Beekes compares Armenian p'andir, Georgian panturi. "The tone is tinkling, but penetrating and agreeable" [Century Dictionary]. Related: Mandolinist.

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banjo (n.)
"guitar-like musical instrument with a circular body covered in front with stretched parchment, like a tambourine," 1764, in various spellings (Thomas Jefferson has banjar), American English, usually described as of African origin, probably akin to Bantu mbanza, name of an instrument resembling a banjo. The word has been influenced by colloquial pronunciation of bandore (1560s in English), a 16c. lute-like stringed instrument, from Portuguese bandurra, from Latin pandura (see mandolin). The origin and the influence might be the reverse of what is here described. Related: Banjoist. The banjo-clock (1891) was so called for its shape.
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oud (n.)
"lute or mandolin of Arab lands," 1738, from Arabic 'ud, literally "wood." Compare lute.
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