Definitions

from the GNU version of the Collaborative International Dictionary of English

  • n. a convex lens of considerable size, used for producing an intense heat by converging the sun's rays to a focus.

from The Century Dictionary and Cyclopedia

  • n. A double convex lens of glass used to ignite combustible substances, melt metals, etc., by focusing upon them the direct rays of the sun.

Etymologies

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Examples

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