American Heritage® Dictionary of the English Language, Fourth Edition
- n. A thin optical lens consisting of concentric rings of segmental lenses and having a short focal length, used primarily in spotlights, overhead projectors, and the headlights of motor vehicles.
GNU Webster's 1913
- (Optics) See under lens.
- n. (Opt.) a compound lens formed by placing around a central convex lens rings of glass so curved as to have the same focus; used, especially in lighthouses, for concentrating light in a particular direction; -- so called from the inventor.
- n. lens composed of a number of small lenses arranged to make a lightweight lens of large diameter and short focal length
- After Augustin Jean Fresnel. (American Heritage® Dictionary of the English Language, Fourth Edition)
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