Corrugated

corrugated
    adj 1: shaped into alternating parallel grooves and ridges; "the
           surface of the ocean was rippled and corrugated"
    

Corrugate \Cor"ru*gate\ (-g?t), v. t. [imp. & p. p. {Corrugated}
   (-g?`t?d); p. pr. & vb. n. {Corrugating} (-g?`t?ng).]
   To form or shape into wrinkles or folds, or alternate ridges
   and grooves, as by drawing, contraction, pressure, bending,
   or otherwise; to wrinkle; to purse up; as, to corrugate
   plates of iron; to corrugate the forehead.
   [1913 Webster]

   {Corrugated iron}, sheet iron bent into a series of alternate
      ridges and grooves in parallel lines, giving it greater
      stiffness.

   {Corrugated paper}, a thick, coarse paper corrugated in order
      to give it elasticity. It is used as a wrapping material
      for fragile articles, as bottles.
      [1913 Webster]
    

corrugated \corrugated\ adj.
   shaped into parallel folds alternately grooved and ridged;
   as, the surface of the ocean was rippled and corrugated.
   [WordNet 1.5]
    

112 Moby Thesaurus words for "corrugated":
      broken, bumpy, canaliculate, canaliculated, chamfered, channeled,
      choppy, coarse, coarse-grained, cockled, cockly, corduroy,
      corduroyed, corrugate, costate, cragged, craggy, creased, crimped,
      crimpy, crinkled, crinkly, cross-grained, crumpled, cut, dadoed,
      engraved, fluted, furrowed, gashed, goffered, gouged, grainy,
      granulated, gravelly, grooved, harsh, homespun, horripilant,
      incised, inequal, ironbound, irregular, jagged, jaggy, jolty,
      knitted, knotted, linsey-woolsey, pimply, pitted, pleated, pocky,
      potholed, puckered, puckery, pursed, pursy, rabbeted, ragged, rank,
      ribbed, ridged, rifled, rimpled, rippled, ripply, rockbound, rocky,
      rough, rough-cast, rough-grained, rough-hewn, rucked, ruffled,
      rugged, rugose, rugous, rumpled, rutted, rutty, saw-toothed,
      sawtooth, scored, scragged, scraggly, scraggy, scratched, serrate,
      serrated, shagged, shaggy, slit, snagged, snaggled, snaggy, stony,
      striated, sulcate, sulcated, textured, troughed, uneven, unkempt,
      unlevel, unpolished, unrefined, unsmooth, ununiform, wimpled,
      wrinkled, wrinkly