Etymology
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scalene (adj.)

"having unequal sides," in mathematics, 1680s, from Late Latin scalenus, from Greek skalenōs "uneven, unequal, odd (numbered)," as a noun, "triangle with unequal sides" (trigōnon skalēnon), from skallein "to chop, hoe, dig, stir up" (compare its derivative, skalops "a mole"), from PIE root *skel- (1) "to cut."

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Definitions of scalene

scalene (adj.)
of a triangle having three sides of different lengths;
scalene (adj.)
of or relating to any of the scalene muscles;
From wordnet.princeton.edu