词根词缀：chemo-, chem-, chemico-, chemi-, -chemist, -chemic, -chemical

【来源及含义】Arabic > Greek > Latin: the art of combining base metals [to make gold]; from Greek, chemia, “Egypt”, supposedly where the art of changing metals into gold existed

【同源单词】agrichemistry, agrochemical, alchemist, alchemy, allelochemics, allochemic

词根词缀：phylacto-, phylact-, phylac-, phylax-

【来源及含义】Greek: guard, protect, preserve

【同源单词】anaphylactic, anaphylaxis, biophylactic, biophylaxis, chemoprophylaxis, crymophylactic