Definition of spiral adjective from the Oxford Advanced Learner's Dictionary

 

spiral

 adjective
adjective
BrE BrE//ˈspaɪrəl//
 
; NAmE NAmE//ˈspaɪrəl//
 
 
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moving in a continuous curve that winds around a central point A snail's shell is spiral in form. Word Origin mid 16th cent. (as an adjective): from medieval Latin spiralis, from Latin spira ‘coil’, from Greek speira ‘a coil’.
See the Oxford Advanced American Dictionary entry: spiral