1
[ noun ] a substance that is fluid at room temperature and pressure

Used in print

(Harry H. Hull, "The Normal Forces and Their Ther...)

There is a small well in the top in which the fluid or paste to be tested is placed .

A tape of cellulose_acetate is pulled between the blocks and the tape pulls the fluid or paste with it between the parallel faces of the blocks .

Although there were only four fluids tested , it was apparent that there were two distinct types .

Two of the fluids showed a high positive normal pressure when undergoing shear , and two showed small negative pressures which were negligible in_comparison_with the amount of the positive pressures generated by the other two .

Figure 3 shows the data on a silicone fluid , labeled 12500 cps which gave a high positive normal pressure .

2
[ noun ] a continuous amorphous substance that tends to flow and to conform to the outline of its container: a liquid or a gas

Used in print

(Harry H. Hull, "The Normal Forces and Their Ther...)

The elasticity as a parameter of fluids which is not subject_to simple measurement at_present , and it is a parameter which is probably varying in an unknown manner with many commercial materials .

Related terms

substance gas liquid ichor

3
[ adjective ] subject to change; variable

Synonyms

unstable

Examples

"a fluid situation fraught with uncertainty" "everything was unstable following the coup

Used in print

("Editorials"...)

In_a_sense , the showdown promised by Mr._Hammarskjold 's sudden and tragic death has been avoided ; no precedents have been set as_yet ; structurally , the U.N. is still fluid , vulnerable to the pressures that its new and enlarged membership are bringing_to_bear upon it .

Related terms

changeable

4
[ adjective ] in cash or easily convertible to cash

Synonyms

liquid

Examples

"liquid (or fluid) assets"

Related terms

disposable

5
[ adjective ] smooth and unconstrained in movement

Examples

"a long, smooth stride" "the fluid motion of a cat" "the liquid grace of a ballerina" "liquid prose"

Related terms

graceful

6
[ adjective ] characteristic of a fluid; capable of flowing and easily changing shape

Synonyms

runny

Related terms

liquid

7
[ adjective ] affording change (especially in social status)

Synonyms

mobile

Examples

"Britain is not a truly fluid society" "upwardly mobile"

Related terms

changeable

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