noun as in strong fondness

Strongest matches

unknown compound, rare substance

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Example Sentences

Example:The unknown compound appeared in the lab test and needed further identification.

Definition:A substance with an unknown composition or structure, often used for compounds whose nature is not yet fully determined.

From unknown compound

Example:Researchers are interested in studying rare substances like this one.

Definition:A substance that is not easily found or common in nature or laboratory tests.

From rare substance