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Webster 1913 Edition

Adj.

[Pref.

im-

not +

miscible

: cf. F.

immiscible

Not capable of being mixed or mingled.

A chaos of

immiscible

and conflicting particles.

Cudworth.

Adj.

[in and miscible.] Not capable of being mixed.

immiscible ‎(comparative more immiscible, superlative most immiscible)

(physics) (of two or more liquids) that are not mutually soluble; unmixable
A mixture of oil, water, and mercury forms three immiscible layers.

not mutually soluble, unmixable