Definition:Isosceles/Linguistic Note
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Linguistic Note on Isosceles
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.