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"Miscible" isn't simply a lesser-known synonym of "mixable"-it's also a cousin. It comes to us from the Medieval Latin adjective "miscibilis," which has the same meaning as "miscible" and which derives in turn from Latin "miscēre," meaning "to mix." "Miscēre" is also the ultimate source of our "mix"; its past participle "mixtus" (meaning "mixed") spawned "mixte" in Anglo-French and Middle English, and "mix" came about as a back-formation of "mixte." The suffix "-able" gives us "mixable," thereby completing its link to "miscible." "Miscible" turns up most frequently in scientific discussions where it is used especially to describe fluids that don't separate when they are combined.

: capable of being mixed; specifically : capable of mixing in any ratio without separation of two phases

Examples

Mr. Remington's class demonstration showed that, to paraphrase an old saying, oil and water are indeed not miscible.

"Joseph is determined to make it on his own, and succeeds in inventing the first laundry detergent miscible in both oil and water." - From a book review by Wingate Packard in The Seattle Times, September 8, 2006