Capable of flowing or being made to flow; having the quality of fluidity.
From Latin 'fluere' meaning 'to flow' plus the suffix '-ible' meaning 'capable of,' creating a word meaning 'capable of flowing' that emerged in 18th-century scientific writing.
Though 'fluible' appears in some historical pharmacy and chemistry texts, it never really caught on because 'fluid' already did the job better—it's a word English created but then politely rejected.
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