saline | ˈseɪlʌɪn | adjectivecontaining or impregnated with salt: saline alluvial soils. • mainly Medicine (of a solution) containing sodium chloride and/or a salt or salts of magnesium or another alkali metal: I was having a saline transfusion day and night. noun [mass noun ] a solution of salt in water. • a saline solution used in medicine.