(1) a solution resembling the blood serum in its salt constituents; it contains 8.6 g of NaCl, 0.3 g of KCl, and 0.33 g of CaCl2 in each 1000 mL of distilled water; used as a fluid and electrolyte replenisher by intravenous infusion. (2) a salt solution usually used in combination with naturally occurring body substances (e.g., blood serum, tissue extracts) and more complex chemically defined nutritive solutions for culturing animal cells. SYN: Ringer lactate.Ringer injection