brownstonebrown‧stone /ˈbraʊnstoʊn/ noun 
1[uncountable] a type of red-brown stone, often used for building in the eastern U.S.2[countable] a house with a front made of this stone
1[uncountable] a type of red-brown stone, often used for building in the eastern U.S.2[countable] a house with a front made of this stone
