CORRUGATE

[cor.ru.gate] vb -gat.ed ; -gat.ing [L corrugatus, pp. of corrugare, fr. com- + ruga wrinkle; prob. akin to Lith raukas wrinkle--more at rough] vt (1620): to form or shape into wrinkles or folds or into alternating ridges and grooves: furrow ~ vi: to become corrugated