'Chromatography' definitions:

Definition of 'chromatography'

noun

A process used for separating mixtures by virtue of differences in absorbency

From: GCIDE

Chromatography \Chro`ma*tog"ra*phy\, n. [Gr. ?, ?, color + -graphy.]
1. A treatise on colors [archaic] [1913 Webster]
2. (Chem.) an analytical and preparative technique for separating substances by differences in their selective adsorption to solids, by passing a liquid over the solid, to which the substances to be separated have usually been adsorbed in a preliminary step. The major variations are column chromatography, in which the substances to be separated are adsorbed to a column with any of a wide variety of adsorbing solids in powdered or granulated form; paper chromatography, in which the solids are applied as a spot at one end of a strip of absorbent paper (such as filter paper), and the liquid is percolated through the paper by capillary action; and thin-layer chromatography (TLC), which is similar to paper chromatography, but the adsorbent material is, instead of paper, a thin layer of finely powdered material, such as cellulose or silica, on a backing of glass or plastic, called a TLC plate. A modern version of {column chromatography} is high-performance liquid chromatography, usually referred to as HPLC. [PJC]