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The Simple English Wikipedia has an article on:

Pronunciation

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Singular
fluid

Plural
fluids

  1. A fluid is something that can flow smoothly and with ease.
    Water, air, and steam are all fluids.

Adjective

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Positive
fluid

Comparative
more fluid

Superlative
most fluid

  1. smoothly and with ease
    It was a fluid, graceful dance.
    Jasha was more fluid in her movements than Jabah.
    Caska was the most fluid of all the dancers.