/ Thesaurus / T Synonyms of trimmer joist Find synonyms for: Noun1. trimmer, trimmer joist, joistusage: joist that receives the end of a header in floor or roof framing in order to leave an opening for a staircase or chimney etc.WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: aversion Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language