# Translations:Dictionary:Eikonal equation/1/en

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{{#category_index:E|eikonal equation}}
(ī kōn’ ∂l) (from Greek (ikon) meaning *image*. An equation derived from the wave equation through the substitution of a harmonic wave trial solution into the wave equation. In one form of the eikonal equation seen in physics literature, the local velocity is compared to a reference velocity (analogous to comparing a velocity to the speed of light in vacuum):