Definition:Isosceles
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Definition
Isosceles Triangle
An isosceles triangle is a triangle in which two sides are the same length.
Isosceles Trapezium
An isosceles trapezium is a trapezium whose legs are the same length.
Linguistic Note
The word isosceles comes from the Greek: $\iota \sigma \omicron \sigma \kappa \epsilon \lambda \epsilon \varsigma$, that is: from iso meaning equal, and skelos meaning leg.
Thus an isosceles triangle is literally an equal-leg triangle.
It is pronounced eye-sos-ell-eez, that is, with the emphasis on the second syllable. Note that the c is silent.
The word skeleton comes from the same linguistic root.