ré·seau or re·seau (r -z  , r -)n. pl. réseaus or re·seaus or réseaux or re·seaux (-z z, -z) 1. A net or mesh foundation for lace. 2. Astronomy A reference grid of fine lines forming uniform squares on a photographic plate or print, used to aid in measurement. 3. A mosaic screen of fine lines of three colors, used in color photography. [French, from Old French reseuil, diminutive of raiz, net, from Latin r  te.] |
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