v. t. [ imp. & p. p. Macadamized p. pr. & vb. n. Macadamizing. ] [ From John Loudon McAdam, who introduced the process into Great Britain in 1816. ] To cover, as a road, or street, parking lot, playground, or other flat area, with macadam, so as to form a smooth, hard, convex surface. Syn. -- tarmac. [ 1913 Webster ]