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Number & MeasureGreekEnglish

Scalene

/ˈskeɪliːn/adjective

Having three sides of different lengths, said of a triangle.

The Greek roots

σκαληνός
skalēnós
uneven, limping

Literally: uneven

The story of the word

σκαληνός described anything lopsided, from a rough road to a person's gait. Geometry pinned it to the triangle with no two sides equal, and English took that sense in the 17th century. Anatomy then borrowed it again for the three neck muscles that form an uneven triangle above the first rib, which is why a physiotherapist and a geometer can both use the word with a straight face.

How it travelled
Ancient Greek → Latin → English
First recorded
17th century

In a sentence

Not one angle matched, so the triangle was scalene.

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