Source : Webster's Revised Unabridged Dictionary (1913)

Macadamize \Mac*ad"am*ize\, 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, with small, broken stones, so
   as to form a smooth, hard, convex surface.