A person who believes in or practices fluidism, the theory that natural phenomena can be explained by the movement and properties of fluids.
From 'fluid' (from Latin 'fluidus' meaning flowing) plus '-ist' (one who practices or believes in). Developed in 18th-century scientific philosophy as scientists tried to explain physical forces through fluid mechanics.
Fluidists were early scientists who thought everything from gravity to electricity worked like water flowing—a wild theory that turned out partially right! Light and other forces do behave somewhat like waves in fluids, which is why physicists still use 'fluid dynamics' concepts.
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