Webster's English Dictionary

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curvilinear

cur.vi.lin.ear or cur.vi.lin.eal \.k*r-v*-'lin-e--*r\ \-e--*l\ 
   \-.lin-e--'ar-*t-e-\ aj [L curvus + linea line] 1: consisting of or bounded 
   or represented by a curved line  2: marked by flowing tracery {~ Gothic}  - 
   cur.vi.lin.ear.i.ty n