Origin: Anc Greek νύμφη/nymph(=in Greek Mythology, nymphs are minor female deities protectors of springs, mountains, and rivers). Nymph via Latin passed as lympha (“water, water nymph”).
In 1622 physician Gaspare Aselli (1581 – 1626), identified lymphatic vessels which appeared as `milky veins” of the intestines in dogs and termed them venae alba et lacteae. In 1628 William Harvey (1578 –1657) discovered a circulatory system where blood recirculates through the body. In 1652, Swedish anatomist Olaus Rudbeck (1630–1702), discovered transparent vessels in the liver that contained clear fluid, and thus named them hepatico-aqueous vessels and compared this to the venous circulatory system. Thomas Bartholin, who additionally published that such vessels are present everywhere in the body named them "lymphatic vessels".
Lymph is a colourless, watery, fluid that circulates around the body tissues and it produced by lymph system to bloodstream carrying mainly leucocytes. (white blood cells) essential for immune response.