Miscible is a fancy word for "mixable." You may have heard that oil and water are not very miscible substances, whereas seltzer and orange juice are miscible and delicious!

Miscible is a word used by chemists to explain why some liquids mix together well, while others do not. Miscible liquids form homogeneous solutions, which is another way of saying liquids that have a uniform nature. Liquids that are not miscible will not form a new liquid; instead, they will each rest separately in a container (like oil and water). Miscible can also refer to solids and gases, although such use of the word is rare.

Definitions of miscible

adj (chemistry, physics) capable of being mixed

capable of forming a homogeneous mixture that neither separates nor is altered by chemical interaction
immiscible, non-miscible, unmixable
(chemistry, physics) incapable of mixing
used especially of solids or solutions; incapable of blending into a stable homogeneous mixture
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