1. Chem. Combining form of CHROMIUM, as in chromo-carbon, -chloride, -cyanotype, -glucose, etc.
1845. Year Bk. of Facts, 234. To distinguish it from the cyanotype process of Sir John Herschell … Mr. Hunt proposed to call it Chromo-cyanotype.
1864. Reader, 26 March, 393/3. The chromo-carbon prints were transferred to zinc.
1875. trans. Vogel’s Chem. Light, xv. 261. If a pigment impression—that is a chromo-glucose-picture—is produced on glass.
1879. Watts, Dict. Chem., I. 955. Tartrate of chromium and hydrogen, or chromo-tartaric acid.
2. Shortened form of CHROMATO- [f. Gr. χρῶμα, χρώματος color, cf. Gr. ἄχρωμος, πολύχρωμος = ἀχρώματος, πολυχρώματος, etc.], as in Chromoblast [Gr. βλαστός sprout, germ], ‘a variety of connective tissue corpuscles found under the skin and in the parenchyma of Batrachia, Mollusca, Annelida, and some fishes. It possesses ramified processes, and contains a black pigment’ (Syd. Soc. Lex.). Chromometer [see -METER. Cf. CHROMATOMETER], an instrument for determining by means of color the presence of minerals in ores. Chromophane [Gr. -φανής appearing, showing], ‘a generic term applied to the different coloring matters of the inner segments of the cones of the retina of animals where they are held in solution by a fat’ (Syd. Soc. Lex.). Chromophore [Gr. -φορ-ος bearing, bearer], see quot. and cf. CHROMOGEN. Chromophotography, a name for the production of photographs of objects in their natural colors. Chromophotolithograph, a photolithograph produced in colors. Chromophyll, Bot. [Gr. φύλλον leaf, after chlorophyll], the coloring principles of plants other than chlorophyll. Chromoptometer. [Cf. CHROMATOPTOMETRY], ‘an instrument for determining the sharpness of the colour sense in man’ (Syd. Soc. Lex.). Hence Chromoptometrical a.
1876. S. Kens. Museum Catal., No. 3720. Weber’s Photo and Chromometer.
1879. Athenæum, 5 April, 444/2. An instrument which he has designed for making accurate determinations of the presence of certain minerals in ores, to which he has given the name of a ‘chromometer.’
1885. W. Stirling, trans. Landois’ Physiol., II. 963. In the cones are the pigmented oil globules, the so-called ‘chromophanes.’
1879. Watts, Dict. Chem., VIII. I. 696. The body whose presence, in conjunction with a salt-forming group, determines the possession of tinctorial power, may be conveniently called a chromophore.
1882. American, III. 263. A successful chromophotolithograph of the old vellum drawing.
1882. Academy, 4 Feb., 77. The chlorophyll … is fading before … those other pigments which Mr. Wallace calls collectively chromophyll.
1876. S. Kens. Museum Catal., No. 3721. Weber’s Chromoptometrical Tables.
