Meaning of anamorphic lens

an'amor'phic lens'

Pronunciation: [key]
— Motion Pictures, Optics.
  1. a compound lens or system of lenses that compresses the camera image in the horizontal direction during filming, so that a wide-screen image can fit on the width of conventional 35-mm film.
  2. a similar system used in projection that horizontally expands the compressed image back to its original wide-screen aspect ratio.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.