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from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A camera lens whose focal length can be rapidly changed, allowing rapid change in the size of an image.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A lens containing a mechanical assembly of inner lenses, allowing the focal length to be changed rapidly.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a camera lens that magnifies the image


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