- n. 螺旋；旋涡；螺旋形之物
- adj. 螺旋形的；盘旋的
- vt. 使成螺旋形；使作螺旋形上升
- vi. 盘旋；成螺旋形；螺旋形上升（过去式spiraled/spiralled，过去分词spiraled/spiralled，现在分词spiraling/spiralling，第三人称单数spirals，副词spirally）
CET6 TEM4 IELTS 考 研 TOEFL
来自拉丁语 spipralis,旋转的，螺旋的，来自 spira,线圈，绕圈，来自 PIE*sper,转动，旋转， 可能来自 PIE*spen,弯，转，纺织，词源同 spider,spin.
- spiral:  Spiral comes via French spiral from medieval Latin spīrālis ‘coiled’, a derivative of Latin spīra. This in turn went back to Greek speira ‘coil’. English also acquired the noun, as spire , which is used for the ‘tip of a spiral shell’. It is not the same word as the spire of a church [OE], which originally meant ‘stalk, stem’, and may go back ultimately to the base *spī- (source of English spike ‘pointed flower head’ and spine). The spiraea  is etymologically the ‘coiled’ plant; and spiraea in turn was used to form the term aspirin.
=> aspirin, spiraea
- spiral (adj.)
- 1550s, from Middle French spiral (16c.), from Medieval Latin spiralis "winding around a fixed center, coiling" (mid-13c.), from Latin spira "a coil, fold, twist, spiral," from Greek speira "a winding, a coil, twist, wreath, anything wound or coiled," from PIE *sper-ya-, from base *sper- (2) "to turn, twist." Related: Spirally. Spiral galaxy first attested 1913.
- spiral (v.)
- 1726 (implied in spiraled), transitive, from spiral (n.). Intransitive use by 1834. Transferred and figurative sense by 1922. Related: Spiraling.
- spiral (n.)
- 1650s, from spiral (adj.). U.S. football sense is from 1896. Figurative sense of "progressive movement in one direction" is by 1897. Of books, spiral-bound (adj.) is from 1937.
- 1. The process is not a circle but rather a spiral.
- 2. The spiral of terrorism becomes never-ending.
- 3. The birds circled in a slow spiral above the house.
- 4. Her hair was styled into a cascade of spiral curls.
- 5. Their profits began to spiral down disastrously.
[ spiral 造句 ]