Breadcrumb Home > Thesaurus > W Synonyms of windowsill Find synonyms for: Noun 1. windowsill, sill usage: the sill of a window; the horizontal member at the bottom of the window frame WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of windowsill (Dictionary) TrendingHere are the facts and trivia that people are buzzing about. Chinese New Year History, Meaning, and Celebrations Current Events This Week: February 2024 Valentine's Day Valentine's Day History Mardi Gras 30 "Charlie and the Chocolate Factory" Quotes ✖ Related Content Daily Word Quiz: deracinate Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language