n. In etching, any resinous coating used to cover parts of the plate which have become exposed: to be distinguished from the ground, which is the original coating applied to the entire plate.n. A solution of resinous matter, forming a clear limpid fluid capable of hardening without losing its transparency: used by painters, gilders, cabinet-makers, and others for coating over the surface of their work in order to give it a shining, transparent, and hard surface, capable of resisting in a greater or less degree the influences of air and moisture.n. That which resembles varnish, either naturally or artificially: a glossy or lustrous appearance.n. An artificial covering to give a fair appearance to any act or conduct; outside show; gloss; palliation; “whitewash.”n. In ceramics, the glaze of pottery or porcelain.To lay varnish on for the purpose of decorating or protecting the surface. See varnish, n., 1.To cover with something that gives a fair external appearance; give an improved appearance to.To give an attractive external appearance to by rhetoric; give a fair coloring to; gloss over; palliate: as, to varnish errors or deformity.To apply varnish, in a general sense.