- spiral (v.)
[spiral 词源字典]
- 1726 (implied in spiraled), transitive, from spiral (n.). Intransitive use by 1834. Transferred and figurative sense by 1922. Related: Spiraling.[spiral etymology, spiral origin, 英语词源]
- spiro-
- word-forming element meaning "twisted, spiraled, whorled," from comb. form of Latin spira "a coil, twist," from Greek speira (see spiral (adj.)).