(before a vowel ery·thr-), combining form of Gr. ἐρυθρό-ς red, in several compounds occurring in Chemistry, with a few in Mineralogy, etc.
Erythro-benzene (see quot.). Erythrolein [see OLEIN]. Erythrolitmin [see LITMUS and -IN], ‘red substances obtained from litmus’ (Watts, Dict. Chem., 1882). Erythrophyll, Chem. [Gr. φῦλλ-ον leaf], the red coloring matter of leaves in autumn. Erythrophyllin, Chem. [see prec. and -IN] = prec. Erythrophytoscope [Gr. φυτό-ν plant + -σκοπος observer] = ERYTHROSCOPE. Erythroprotid [see PROTEID or PROTIDE], ‘a red extractive matter obtained by Mulder from albumin and allied substances.’ Erythroretin, Chem. [see RET-ENE and -IN], ‘a resinous constituent of rhubarb-root, soluble with purple-red colour in alkalis’ (Watts, Dict. Chem., 1882). Erythroscope [Gr. -σκοπος observer], an optical contrivance, by which the green of foliage is caused to appear red, while all other green objects retain their natural hue (see quot.). Erythrosiderite, Min. [Gr. σίδηρ-ος + -ITE], a hydrous chloride of potassium and iron formed by sublimation in the lavas of Vesuvius. Erythrozyme, Chem. [Gr. ζύμη leaven], ‘an azotised substance which exists in madder root, and gives rise to a peculiar transformation of rubian’ (Watts, Dict. Chem., 1882).
1879. Watts, Dict. Chem., VI. 583. *Erythrobenzene, a red colouring matter prepared from nitrobenzene by leaving 12 pts. of that substance in contact with 24 pts. of fine iron filings and 6 pts. strong hydrochloric acid, for 24 hours at ordinary temperatures. Ibid. (1882), III. 731. *Erythrolitmin forms crystalline grains of a fine deep red colour, coloured blue by potash.
1875. Bennett & Dyer, trans. Sachs’ Bot., 686. *Erythrophyll group.
1884. Bower & Scott, De Bary’s Phaner. & Ferns, 66. Cell-sap … tinted with dissolved pigments (Erythrophyll, &c.).
1876. S. Kens. Museum Catal., No. 3702. *Erythrophytoscope.
1845. G. Day, trans. Simon’s Anim. Chem., I. 29. Glutin and water may be supposed to be formed from protid and *erythroprotid by the ammonia.
1852–9. Todd, Cycl. Anat., IV. 164/2. Erythroprotid, when pure, is of a fine red colour.
1876. Harley, Mat. Med., 466. Rhubarb contains 3 resins, aporetin phœoretin, and *erythroretin.
1876. S. Kens. Museum Catal., No. 3700. *Erythroscope.
1879. Rood, Chromatics, vii. 83. Simler has constructed a simple … apparatus, based on the singular property which living leaves have of reflecting abundantly the extreme red rays of the spectrum: it is called an erythroscope.
1875. Dana, Min., App. ii. 19. *Erythrosiderite … Color red. Very soluble.
1876. trans. Schützenberger’s Ferment., 24. In the fermentation of sugar by means of *erythrozyme.
