‘连环’ literally means 'linked rings' — the character 连 (lián) means 'to connect' or 'to link', and 环 (huán) means 'ring' or 'loop'. Together, they form a compound noun describing physical rings joined together (like a chain) or, more commonly, things arranged in a serial, interdependent sequence. Historically, ‘连环’ appears in idioms like 连环计 (liánhuán jì, 'linked stratagem') — a series of interlocking schemes — and in modern usage often refers to serial formats: comic books (连环画, liánhuánhuà), TV dramas (连环剧), or even biological structures like 'linked ring' proteins.

In zoology, 连环 is used specifically to describe certain animal behaviors or anatomical features involving repetition or linkage — for example, the 'chain migration' pattern in birds or the linked vertebrae in some reptiles. It conveys continuity, causality, and structural interdependence, never just simple repetition.