Field glass Meaning, Definition & Usage

  1. noun a small refracting telescope
    glass; spyglass.

WordNet

Definitions
  1. . (Optics) (a) A binocular telescope of compact form; a lorgnette; a race glass. (b) A small achromatic telescope, from 20 to 24 inches long, and having 3 to 6 draws. (c) See Field lens.

Webster 1913