Bil·low, v. i. [imp. & p. p. Billowed p. pr. & vb. n. Billowing.] To surge; to rise and roll in waves or surges; to undulate. “The billowing snow.”
  ◄ ►
  billowing
       adj 1: moving in surges and billows and rolls; "billowing smoke
              from burning houses"; "the rolling fog"; "the rolling
              sea"; "the tumbling water of the rapids" [syn: rolling,
               tumbling]
       2: characterized by great swelling waves or surges; "billowy
          storm clouds"; "the restless billowing sea"; "surging
          waves" [syn: billowy, billowing(a), surging]