Cantar \Can"tar\, Cantarro \Can*tar"ro\, n. [It. cantaro (in sense 1), Sp. cantaro (in sense 2).] 1. A weight used in southern Europe and East for heavy articles. It varies in different localities; thus, at Rome it is nearly 75 pounds, in Sardinia nearly 94 pounds, in Cairo it is 95 pounds, in Syria about 503 pounds. 2. A liquid measure in Spain, ranging from two and a half to four gallons. --Simmonds.