CIMARRON Meaning of CIMARRON in English /sim"euh ron', -rohn', -euhr euhn; sim'euh rohn"/ , n.a river flowing E from NE New Mexico to the Arkansas River in Oklahoma. 600 mi. (965 km) long. Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012