involute

Definitions of involute
  1. adjective
    especially of petals or leaves in bud; having margins rolled inward
    synonyms: rolled
    coiled
    curled or wound (especially in concentric rings or spirals)
  2. adjective
    (of some shells) closely coiled so that the axis is obscured
    Synonyms:
    coiled
    curled or wound (especially in concentric rings or spirals)
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