Antonyms:

coiled

curled or wound (especially in concentric rings or spirals)

coiling, helical, spiral, spiraling, turbinate, volute, voluted, whorled

in the shape of a coil

convolute, convoluted

rolled longitudinally upon itself

involute

(of some shells) closely coiled so that the axis is obscured

involute, rolled

especially of petals or leaves in bud; having margins rolled inward

wound

put in a coil

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