单词 | medullin |
释义 | medullinn. Chemistry. Now rare. A form of cellulose derived from the pith of certain plants, esp. the sunflower. ΘΚΠ the world > matter > chemistry > organic chemistry > carbohydrates > sugars > polysaccharides > [noun] > cellulose > specific that found in plants medullin1817 lignin1822 bastose1882 1817 T. Thomson Syst. Chem. (ed. 5) IV. 182 Of Medullin. This is the name given by Dr. John to the pith of the sun~flower, &c. 1828 N. Webster Amer. Dict. Eng. Lang. Medullin, the pith of the sunflower, which has neither taste nor smell. It is insoluble in water, ether, alcohol, and oils, but soluble in nitric acid, and instead of yielding suberic acid, it yields the oxalic. 1830 J. Lindley Introd. Nat. Syst. Bot. 200 The pith of the Sunflower has been stated by John to be a peculiar chemical principle, which he calls Medullin. 1928 B. D. Jackson Gloss. Bot. Terms (ed. 4) 225/2 Medullin, the cellulose from pith of the sun-flower and lilac. This entry has been updated (OED Third Edition, June 2001; most recently modified version published online March 2022). < n.1817 |
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