adjective
Definition: Relating to a specific type of mixture or alloy that has a particular composition and melting point, where the components solidify together at a lower temperature than their individual melting points.
Example: The eutectoid structure in steel is crucial for its hardness and strength.
noun
Definition: A specific type of mixture or alloy that forms when two or more components solidify together at a particular composition and temperature, resulting in a uniform structure.
Example: The steel was treated to achieve a eutectoid structure, enhancing its strength and durability.