saltwater \ˈ ̷ ̷| ̷ ̷ ̷ ̷\adjective Etymology:salt water 1.: of or belonging to salt water : living in or taken from salt water < saltwater fish > < saltwater terrapin > 2.: consisting of salt as opposed to fresh water < a saltwater lake > 3.: taking place in or on salt water < saltwater plunge > 4.: accustomed to navigating in salt waters < saltwater sailor > 5.: of or relating to the sea < saltwater songs >