alkaloid
noun [ C ] chemistry specialized uk/ˈæl.kə.lɔɪd/ us/ˈæl.kə.lɔɪd/
生物碱（植物中的化学物质，常用于制药或作为毒物）
a type of chemical found in plants that often acts as a drug or poison, or is used in medicines
Morphine and cocaine are powerful alkaloids. 吗啡和可卡因是强力的生物碱。