blue blood (adj.)youdaoicibaDictYouDict[blue blood 词源字典]
1809 in reference to the blood that flows in the veins of the old and aristocratic families of Spain, translating Spanish sangre azul, claimed by certain families of Castile as uncontaminated by Moorish or Jewish admixture; the term is probably from the notion of the visible veins of people of fair complexion. In reference to English families by 1827. As a noun, "member of an old and aristocratic family," by 1877.[blue blood etymology, blue blood origin, 英语词源]
brownfield (n.)youdaoicibaDictYouDict
abandoned or disused industrial land, often contaminated to some degree, 1992, American English, from brown (adj.) + field (n.).
decontaminate (v.)youdaoicibaDictYouDict
1936, from de- + contaminate. Originally in reference to poison gas. Related: Decontaminated; decontaminating.
infection (n.)youdaoicibaDictYouDict
late 14c., "infectious disease; contaminated condition;" from Old French infeccion "contamination, poisoning" (13c.) and directly from Late Latin infectionem (nominative infectio), noun of action from past participle stem of Latin inficere (see infect). Meaning "communication of disease by agency of air or water" (distinguished from contagion, which is body-to-body communication), is from 1540s.
listeriayoudaoicibaDictYouDict
"A type of bacterium which infects humans and other warm-blooded animals through contaminated food", 1940s: modern Latin, named after Joseph Lister (see Lister, Joseph).