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：hem-, haem-, hemo-, haemo, hema-, haema-, hemato-, haemato-, hemat-, haemat-, -hemia, -haemia, -hemic, -haemic

【来源及含义】Greek: blood

【相关词根词缀】Inter-related cross references, directly or indirectly, involving "blood" word units: angi-; apheresis; -emia; hemoglobin-; phleb-; sangui-; vas-; vascul-.

【同源单词】actinohematin, angiohemophilia, anhematosis, anhemolytic, anhemopoiesis, antihemagglutinin

词根词缀：photo-, phot-, -photic

【来源及含义】Greek: light; ultraviolet and infrared radiation; radiant energy

【相关词根词缀】 Etymologically related "light, shine, glow" word families: ethero-; fulg-; luco-; lumen-, lum-; luna, luni-; lustr-; phengo-; pheno-; phospho-; scinti-, scintill-; splendo-.

【同源单词】aphotesthesia, aphotic, aphototaxis, aphototropism, astrophotograph, astrophotographer

词根词缀：therap-, -therapeutic[s], -therapeutically, -therapy, -therapies, -therapist

【来源及含义】Greek: heal, cure; treatment; service done to the sick, [a waiting on]

【同源单词】actinotherapy, actinotherapy, aerohydrotherapy, aeroionotherapy, aeropiesotherapy, aerotherapy