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

spiral

adjective
 
/ˈspaɪrəl/
 
/ˈspaɪrəl/
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  1. moving in a continuous curve that winds around a central point
    • A snail's shell is spiral in form.
    Topics Colours and Shapesc1
    Word Originmid 16th cent. (as an adjective): from medieval Latin spiralis, from Latin spira ‘coil’, from Greek speira ‘a coil’.
See spiral in the Oxford Advanced American Dictionary
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