Etymology
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Words related to -in

prolactin (n.)

"hormone which promotes lactation," 1932, from pro- + stem of lactation + chemical suffix -in (2).

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prostaglandin (n.)

substance found in seminal fluid, 1936, from German (1935); see prostate + gland + chemical suffix -in (2).

renin (n.)

enzyme found in kidneys, 1894, from German Renin, from Latin renes "kidneys" (see renal) + -in (2).

rennin (n.)

milk-curdling enzyme, 1897, from rennet (n.1) + -in (2).

saccharin (n.)

white crystalline compound, odorless but intensely sweet, used as a sugar substitute, 1885, from German, coined 1879 by Russian-born chemist Constantin Fahlberg (1850-1910), who discovered it by accident, from Latin saccharon (see saccharine); for ending see -in (2). Marketed from 1887 as saccharine.

serotonin (n.)

neurotransmitting chemical, 1948, coined from sero-, combining form of serum (q.v.) + ton(ic) + chemical suffix -in (2).

toxin (n.)

"organic poison," especially one produced by bacteria in an animal body, 1886, from toxic + -in (2).

trypsin (n.)

chief digestive enzyme of pancreatic juice, 1876, coined 1874 by German physiologist Wilhelm Friedrich Kühne (1837-1900), apparently from Greek tripsis "rubbing, friction" (from tribein "to rub, rub down, wear away," from PIE root *tere- (1) "to rub, turn") + chemical suffix -in (2). Said to be so called because it first was obtained (in 1862) by rubbing the pancreas with glycerin.

vanillin (n.)

substance prepared from fruit of the vanilla plant, 1859, from vanilla + -in (2).

vasopressin (n.)

1928, from vasopressor "causing the constriction of (blood) vessels) (from vaso-, combining form of Latin vas "container, vessel;" see vas) + -in (2).

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