fixative

English Thesaurus

1. a varnish dissolved in alcohol and sprayed over pictures to prevent smudging (noun.artifact)

hypernym	:	varnish,
definition	:	a coating that provides a hard, lustrous, transparent finish to a surface (noun.artifact)

2. a compound (such as ethanol or formaldehyde) that fixes tissues and cells for microscopic study (noun.substance)

hypernym	:	fixer, fixing agent,
definition	:	a chemical compound that sets or fixes something (as a dye or a photographic image) (noun.substance)