A substance that has no fixed shape and yields easily to external pressure; a gas or (especially) a liquid
the fluid seeps up the tube
The aqueous fluid contained within the body; the total amount of this; (as a count noun) any fluid contained in or excreted or secreted by the body (blood, haemolymph, cerebrospinal fluid, urine, semen, etc.).
Fluid used in a hydraulic brake system
An anti-knock petrol additive in which tetraethyl lead is the active ingredient and primary constituent.
A unit of capacity equal to one sixteenth of a US pint (approximately 0.03 liter)
A hypothetical fluid that has no viscosity (no internal friction) and is incompressible.
Denoting or relating to a person who does not identify themselves as having a fixed gender
A latex-based fluid used in watercolour painting to keep certain areas free of paint.
An aqueous solution of potassium dichromate and sodium sulphate used for fixing and hardening tissue samples.
Extracellular fluid that bathes the cells of most tissues, arriving via blood capillaries and being removed via the lymphatic vessels
The fluid surrounding a fetus within the amnion
A subtle, imponderable, all-pervading fluid that was formerly thought to be the cause of electrical phenomena. Also figurative. Compare earlier electric fire.
The branch of mechanics dealing with the properties of fluids in various states and with their reaction to forces acting upon them
An alkaline fluid secreted by the prostate gland during ejaculation that forms part of the semen
An opaque liquid painted over a typed or written error so as to leave a blank space for the insertion of the correct character
= electric fluid.
The serous fluid secreted by the inner layer of the pericardium.
Clear watery fluid that fills the space between the arachnoid membrane and the pia mater
A liquid measure formerly used by apothecaries, equivalent to 60 minims or one eighth of a fluid ounce
Having a thick consistency between solid and liquid