The Collaborative International Dictionary
Immiscible \Im*mis"ci*ble\, a. [Pref. im- not + miscible: cf. F. immiscible.]
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Not capable of being mixed or mingled.
A chaos of immiscible and conflicting particles.
--Cudworth. Specifically: (Chem.) Not miscible; forming two distinct phases when mixed at some concentration; -- of two liquids; as, water and gasoline are immiscible.
Douglas Harper's Etymology Dictionary
Wiktionary
a. (context physics English) (''of two or more liquids'') that are not mutually soluble; unmixable
WordNet
Usage examples of "immiscible".
He actually appeared to seriously consider for several minutes what was claimed to be a genuine twentieth-century reproduction lamp, of Jacksonian manufacture, consisting of a sealed glass vessel containing two immiscible liquids which slowly rose and fell in the convection currents.