index register

Noun
  1. (computer science) a register used to determine the address of an operand (synset 103572815)
    referred to in: computer science, computing - the branch of engineering science that studies (with the aid of computers) computable processes and structures
    is a type of: register - (computer science) memory device that is the part of computer memory that has a specific address and that is used to hold information of a specific kind

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