Etymology
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shellac (n.)

also shell lac, 1713, from shell (n.) + lac. Translates French laque en écailles "lac in thin plates." Commercially, lac was considered as stick lac (still on the twigs, insects and all), seed-lac (resin without the twigs and insects, partly processed), and fully processed plates of shell lac.

shellac (v.)

1876, from shellac (n.). The slang sense of "beat soundly" is 1920s, perhaps from the notion of shellac as a "finish." Shellacked "drunk" is from 1922 (compare plastered). Related: Shellacking.

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Definitions of shellac
1
shellac (n.)
lac purified by heating and filtering; usually in thin orange or yellow flakes but sometimes bleached white;
shellac (n.)
a thin varnish made by dissolving lac in ethanol; used to finish wood;
Synonyms: shellac varnish
2
shellac (v.)
cover with shellac;
She wanted to shellac the desk to protect it from water spots
Synonyms: shellack
From wordnet.princeton.edu