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单词 cross hairs
释义

WordReference Random House Unabridged Dictionary of American English © 2024
cross′ hairs′, 
    1. OpticsAlso called cross wires. fine wires or fibers, strands of spider web, or the like, crossing in a focal plane of an optical instrument to center a target or object or to define a line of sight.
    2. Printingmarks for aiding in the positioning of overlaying images for correct registration in printing. Cf. register (def. 11b).
    • 1880–85

Collins Concise English Dictionary © HarperCollins Publishers::
cross hairs pl n
  1. two fine mutually perpendicular lines or wires that cross in the focal plane of a theodolite, gunsight, or other optical instrument and are used to define the line of sight
    Also called: cross wires
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更新时间：2025/7/23 12:32:52