Entry 1 sense Webster, 1913 Sarcolactic · Sar·co·lac·tic · IPA 01 a. Relating to muscle and milk; as, sarcolactic acid. See Lactic acid, under Lactic. 1. Relating to muscle and milk; as, sarcolactic acid. See Lactic acid, under Lactic.(Physiol. Chem.) See: Lactic