(biology) Any organism that subsists on liquids derived from other organisms.

A fluid that reduces friction within the pericardium by lubricating the epicardial surface, allowing the membranes to glide over each other with each heartbeat.

(anatomy) A transparent, viscous, non-Newtonian lubricating fluid which is found in the cavities of synovial joints or bursae and secreted by the synovial membrane; its main purpose is to reduce friction between the articular cartilage of synovial joints during movement.

(colloquial) cerebrospinal fluid

(colloquial) cerebrospinal fluid

A fluid that functions as a coolant and lubricant in a machine tool

A special fluid for operating hydraulic brakes and clutches, which are linked by pipe to a master cylinder. / (prison slang) Sedative drugs used to calm down a prisoner.

Alternative form of genderfluid

lacrimal fluid

Fluid secreted by the lacrimal glands to lubricate the eye and fight bacteria. It consists of water, mucin, lipids, lysozyme, lactoferrin, lipocalin, lacritin, immunoglobulins, glucose, urea, sodium, and potassium.