Webster's Revised Unabridged Dictionary · 1913

Varnish

Varnish , noun

[Old English vernish, French vernis, Late Latin vernicium; akin to French vernir to varnish, from (assumed) Late Latin vitrinire to glaze, from Late Latin vitrinus glassy, from Latin vitrum glass. See Vitreous.]

1.
A viscid liquid, consisting of a solution of resinous matter in an oil or a volatile liquid, laid on work with a brush, or otherwise. When applied the varnish soon dries, either by evaporation or chemical action, and the resinous part forms thus a smooth, hard surface, with a beautiful gloss, capable of resisting, to a greater or less degree, the influences of air and moisture.

According to the sorts of solvents employed, the ordinary kinds of varnish are divided into three classes: spirit, turpentine, and oil varnishes.

2.
That which resembles varnish, either naturally or artificially; a glossy appearance.
The varnish of the holly and ivy. — Macaulay
3.
An artificial covering to give a fair appearance to any act or conduct; outside show; gloss.
And set a double varnish on the fame The Frenchman gave you. — Shakespeare
Collocations (1)
Varnish tree (Botany) , a tree or shrub from the juice or resin of which varnish is made, as some species of the genus Rhus, especially Rhus vernicifera of Japan. The black varnish of Burmah is obtained from the Melanorrhoa usitatissima, a tall East Indian tree of the Cashew family. See Copal, and Mastic.

Varnish , transitive verb

[Compare French vernir, vernisser. See Varnish, n.]

1.
To lay varnish on; to cover with a liquid which produces, when dry, a hard, glossy surface; as, to varnish a table; to varnish a painting.
2.
To cover or conceal with something that gives a fair appearance; to give a fair coloring to by words; to gloss over; to palliate; as, to varnish guilt.
Beauty doth varnish age. — Shakespeare
Close ambition, varnished o'er with zeal. — Milton
Cato's voice was ne'er employed To clear the guilty and to varnish crimes. — Addison