acidophilus (adj.)youdaoicibaDictYouDict[acidophilus 词源字典]
1920, used of milk fermented by acidophilic bacteria, from acidophil (1900), a hybrid word, from Latin acidus "acidic" (see acid (adj.)) + Greek philos "loving" (see -phile); the bacteria so called because they stain easily with an acid dye.[acidophilus etymology, acidophilus origin, 英语词源]