- R'eseau R['e]`seau" (r[=a]`z[=o]"), n. [F.] A network; specif.: (a) (Astron.) A system of lines forming small squares of standard size, which is photographed, by a separate exposure, on the same plate with star images to facilitate measurements, detect changes of the film, etc. (b) In lace, a ground or foundation of regular meshes, like network. [Webster 1913 Suppl.]
The Collaborative International Dictionary of English. 2000.