(of a cone or the like) having the axis inclined to the base.
(of a triangle) having three unequal sides.
Anatomy. of or pertaining to a scalenus muscle.

1635–45; < Late Latin scalēnus < Greek skalēnós unequal Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
scalene (ˈskeɪliːn)
1.  maths (of a triangle) having all sides of unequal length
2.  anatomy of or relating to any of the scalenus muscles
[C17: from Late Latin scalēnus with unequal sides, from Greek skalēnos]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

"having unequal sides," 1684, from L.L. scalenus, from Gk. skalenos "uneven, unequal, rough," from skallein "chop, hoe," related to skelos "leg" (lit. "bending") and skolios "crooked," from PIE *(s)qel- "crooked, curved, bent, perverted."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
scalene   (skā'lēn')  Pronunciation Key 
Having three unequal sides, as a triangle that is neither equilateral nor isosceles.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Have the words equilateral, isosceles, and scalene written on labels placed on a mat on the floor.
Have the participants draw a scalene triangle and copy it several times to make congruent triangles.
Related Words
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