amtrac/ˈæm.tɹæk/EtymologyBlend of amphibious + tractor.amtrac means an amphibious vehicle of a class introduced in World War II. Lexicurio rates it Sui generis — a strength score of 88 out of 100.amtrac is pronounced /ˈæm.tɹæk/.nounAn amphibious vehicle of a class introduced in World War II.