scalene

/ˌˈskeɪˌˈlin/

In geometry, a scalene triangle has three sides that are all different lengths. In addition to scalene triangles, there are isosceles, which have two equal sides, and equilateral triangles, which have three equal sides.

When it comes to the word scalene, it's pretty important who's using it, and in what context. If your math teacher mentions scalene triangles, you know she's talking about shapes with three unequal sides and three unequal angles. But if a doctor or massage therapist uses the word, she is probably referring to the scalene muscles of the neck, three pairs that differ in length. The Greek root is skalenos, "uneven or unequal."

Definitions of scalene

1. adjective

   of a triangle having three sides of different lengths
2. adjective

   of or relating to any of the scalene muscles