lymph

(obsolete, literary) Pure water.

(archaic, botany) The sap of plants.

(physiology) A colourless, watery, coagulable bodily fluid which bathes the tissues and is carried by the lymphatic system into the bloodstream; it resembles blood plasma in containing white blood cells and especially lymphocytes but normally few red blood cells and no platelets.

(immunology) The discharge from a sore, inflammation etc.