WordNet (r) 3.0 (2006):

spiraling
    adj 1: in the shape of a coil [syn: coiling, helical,
           spiral, spiraling, volute, voluted, whorled,
           turbinate]

Moby Thesaurus II by Grady Ward, 1.0:

82 Moby Thesaurus words for "spiraling":
   anabatic, ascendant, ascending, ascensional, ascensive, circling,
   circuition, circuitousness, circuitry, circularity, circulation,
   circumambience, circumambiency, circumambulation, circumflexion,
   circumlocution, circummigration, circumnavigation, climbing,
   cutthroat, deviance, deviancy, deviation, deviousness, digression,
   exacting, excessive, excursion, excursus, exorbitant, extortionate,
   extravagant, fancy, gouging, grossly overpriced, gyre, gyring,
   immoderate, in the ascendant, indirection, inflationary,
   inordinate, leaping, meandering, mounting, orbit, orbiting,
   out of bounds, out of sight, outrageous, overpriced, preposterous,
   prohibitive, rampant, rearing, rising, roundaboutness, rounding,
   saltatory, scandent, scansorial, skyrocketing, spiral, springing,
   turn, turning, unconscionable, undue, unreasonable, unwarranted,
   uparching, upcoming, upgoing, upgrade, uphill, uphillward,
   uprising, upsloping, upward, upwith, usurious, wheeling