Etymology
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Words related to -in

fibrin (n.)

blood-clotting substance, 1800, from Latin fibra "a fiber, filament" (see fiber) + chemical suffix -in (2). So called because it is deposited as a network of fibers that cause the blood to clot.

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heparin (n.)

substance found in the liver, lungs and other tissues, 1918, from Greek hēpar "liver" (see hepatitis) + -in (2).

keratin (n.)

basic substance of horns, nails, feathers, etc., 1848, from Greek keras (genitive keratos) "horn of an animal; horn as a substance" (from PIE root *ker- (1) "horn; head") + chemical suffix -in (2).

lanolin (n.)

fatty matter extracted from sheep's wool, 1885, from German Lanolin, coined by German physician Mathias Eugenius Oscar Liebreich (1838-1908) from Latin lana "wool" (from PIE root *wele- (1) "wool;" see wool) + oleum "oil, fat" (see oil (n.)) + chemical suffix -in (2).

lignin (n.)

organic substance forming the basis of wood-cells, 1821, from Latin lignum "wood" (see ligni-) + chemical suffix -in (2).

melanin (n.)

dark brown or black pigment found in animal bodies, 1832, Modern Latin, with chemical suffix -in (2); the first element is from Greek melas (genitive melanos) "black" (see melano-). Related: Melanism; melanistic.

niacin (n.)

"pellagra-preventing vitamin in enriched bread," 1942, coined from first syllables of  nicotinic acid (see nicotine) + chemical suffix -in (2). It was suggested by the American Medical Association as a more commercially viable name than nicotinic acid.

The new name was found to be necessary because some anti-tobacco groups warned against enriched bread because it would foster the cigarette habit. ["Cooperative Consumer," Feb. 28, 1942]
nucleic (adj.)

"referring to a nucleus," 1892, in nucleic acid, which is a translation of German Nukleinsäure (1889), from Nuklein "substance obtained from a cell nucleus" (see nucleus + -in (2)) + -ic.

pepsin (n.)

also pepsine, "fermin found in gastric juice, used medicinally for cases of indigestion," 1844, coined in German (Theodor Schwann, 1835) from Greek pepsis "digestion; a cooking," from stem pep- (see peptic) + -in (2).

porphyria (n.)

metabolic disorder, 1923, from porphyrin (1910), the name of the type of chemical which, in imbalance, causes it, from German porphyrin (1909), chemical name, from Greek porphyros "purple" (see purple) + -in (2). Some of the compounds are purple.

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