/ Thesaurus / I Synonyms of index register Find synonyms for: Noun1. index register, registerusage: (computer science) a register used to determine the address of an operandWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: languid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language