fixative

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fixative

1. a fluid usually consisting of a transparent resin, such as shellac, dissolved in alcohol and sprayed over drawings to prevent smudging
2. Cytology a fluid, such as formaldehyde or ethanol, that fixes tissues and cells for microscopic study
3. a substance added to a liquid, such as a perfume, to make it less volatile
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

fixative

[′fik·səd·iv]
(materials)
A chemical or a mixture of chemicals used to treat biological specimens before preservation so as to retain a reasonable facsimile of their appearance when alive.
A substance used to increase the durability of another substance; used to fix dye mordants, hold textile dyes and pigments, and slow the rate of perfume evaporation. Also known as fixing agent.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.