It's a rather specialised civil engineering-related word - in UK, the closest most people would get to this word is probably 'tarmac', used as a general term when they refer to the surface of a road or airport runway.

Macadam is the inventor of the macdamization....to macadamize the road ... means to cover it by the black substance that makes the ground smoother for cars. ( This info is as far as I know....not 100% sure of it)

haha, I don't speak french, but they seem to have some meanings for the word: * le macadam, une technique d'empierrement des chaussées développée par l'Écossais John Loudon McAdam * Macadam tribus, une émission de radio de Radio-Canada * Macadam, un film français réalisé par Marcel Blistène en 1946 * Macadam, créé en 1993, le premier journal de rue parisien * la noix de macadam, ou noix de macadamia, noix du Queensland Apparently, the macadam road covering was created by a guy called MacAdam. That makes sense!

I learned now from Nana Wu and Neal the meaning of 'macadam'. I had never heard of it either. a google search produced the following: A song called the Macadam Massacre, by Berurier Noir , and another one by Mando Diao - Macadam cowboy. There is a city called Macadam in New Brunswick, Canada. There is a motorcycle tyre called Macadam (probably for driving on a "road surface of broken stones: a smooth hard road surface made from small pieces of stone, usually mixed with tar or asphalt, in compressed layers" - quoting Nana Wu.