Breadcrumb Home > Thesaurus > C Synonyms of caffeine Find synonyms for: Noun 1. caffeine, caffein, alkaloid usage: a bitter alkaloid found in coffee and tea that is responsible for their stimulating effects WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of caffeine (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: apotheosis Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language