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Relative pronouns is your answer.
Relative Pronoun: A pronoun that introduces relative clauses and the element modified.
Relative Clause: An adjective clause introduced by a pronoun.
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Answer:

Pronouns that introduce adjective clauses and relate to words or ideas which precede them are called relative pronouns.

Explanation:

Relative pronouns -such as who, whose, whome, which or that- are used to refer to a noun, either singular or plural, mentioned earlier in the sentence when we want to add information about it. They usually introduce relative or adjective clauses.