Saline/ˈseɪliːn/ Definition 1 of 4Pro Tip 1/3Scientific Descriptions Used to describe environments or solutions in biology, geology and chemistry. Scientists often study saline lakes for unique ecosystems. Pro Tip 2/3Not Just Ocean 'Saline' refers to any water with salt, not just sea water. The saline content of the lake varies seasonally. Pro Tip 3/3Technical Characteristic Used in technical contexts to specify salt concentration levels. The experiment required saline with precise salinity.