Webster's Revised Unabridged Dictionary · 1913

Immiscible

Immiscible , adjective

[Prefix im- not + miscible: compare French immiscible.]

1.
Not capable of being mixed or mingled.
A chaos of immiscible and conflicting particles. — Cudworth
2.
(Chemistry) Not miscible; forming two distinct phases when mixed at some concentration; -- of two liquids; as, water and gasoline are immiscible.