tetracycline
n.
1952, with chemical suffix -ine(2) + tetracyclic "containing four fused hydrocarbon rings," from tetra- + cyclic (see cycle, n.).
〔李〕n. 四环素 [tetra- =four；cycl =ring] ←-in，-ine 1[L] [化、医] 表示“⋯素”
〔蒋〕[tetra四，cycl环，-ine表药物名称][药]四环素
〔李〕[tetra=four 四；cycl=circle, ring 环；-ine n.=medicine药→] n. medicine of four-ring compounds in which carbon atoms are linked with other atoms四环素