Dictionary > English Dictionary > Definition, synonym and antonym of fluid
Meaning of fluid by Wiktionary Dictionary



    From Latin fluidus ( “flowing, fluid” ), from fluere ( “to flow” ), akin to Ancient Greek φλύειν ( fluein, “to swell, overflow” ). Several related terms in English from Latin ( fluent, flux ), and cognate from Proto-Indo-European ( via Germanic ) with flow .


    • ( US ) IPA: /ˈfluwɪd/


    fluid ( countable and uncountable; plural: fluids )

    1. Any substance which can flow with relative ease, tends to assume the shape of its container, and obeys Bernoulli's principle; a liquid, gas or plasma

    Derived terms


    fluid ( comparative more fluid, superlative most fluid )

    1. ( not comparable ) Of, or relating to fluid .
    2. In a state of flux; subject to change .
    3. Moving smoothly, or giving the impression of a liquid in motion .
    4. ( of an asset ) Convertible into cash .

    Related terms

    External links

    • fluid in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913
    • fluid in The Century Dictionary, The Century Co., New York, 1911
    • fluid at OneLook Dictionary Search

Explanation of fluid by Wordnet Dictionary


    1. subject to change

    2. a fluid situation fraught with uncertainty
    3. affording change ( especially in social status )

    4. Britain is not a truly fluid society
    5. in cash or easily convertible to cash

    6. liquid ( or fluid ) assets
    7. smooth and unconstrained in movement

    8. the fluid motion of a cat
    9. characteristic of a fluid

    1. continuous amorphous matter that tends to flow and to conform to the outline of its container: a liquid or a gas

    2. a substance that is fluid at room temperature and pressure

    Definition of fluid by GCIDE Dictionary


    1. Fluid ( flūĭd ), a. [L. fluidus, fr. fluere to flow: cf. F. fluide. See Fluent.] Having particles which easily move and change their relative position without a separation of the mass, and which easily yield to pressure; capable of flowing; liquid or gaseous.

    2. Fluid, n. A fluid substance; a body whose particles move easily among themselves.

      ☞ Fluid is a generic term, including liquids and gases as species. Water, air, and steam are fluids. By analogy, the term was sometimes applied to electricity and magnetism, as in phrases electric fluid, magnetic fluid, though not strictly appropriate; such usage has disappeared.

      Fluid dram, or Fluid drachm, a measure of capacity equal to one eighth of a fluid ounce. -- Fluid ounce. In the United States, a measure of capacity, in apothecaries' or wine measure, equal to one sixteenth of a pint or 29.57 cubic centimeters. This, for water, is about 1.04158 ounces avoirdupois, or 455.6 grains. In England, a measure of capacity equal to the twentieth part of an imperial pint. For water, this is the weight of the avoirdupois ounce, or 437.5 grains. -- Fluids of the body. ( Physiol. ) The circulating blood and lymph, the chyle, the gastric, pancreatic, and intestinal juices, the saliva, bile, urine, aqueous humor, and muscle serum are the more important fluids of the body. The tissues themselves contain a large amount of combined water, so much, that an entire human body dried in vacuo with a very moderate degree of heat gives about 66 per cent of water. -- Burning fluid, Elastic fluid, Electric fluid, Magnetic fluid, etc. See under Burning, Elastic, etc.