Breadcrumb Home > Dictionary > Index T thallus: Meaning and Definition of Find definitions for: thal•lus Pronunciation: (thal'us), [key] — pl. thal•li thal•lus•es. a simple vegetative body undifferentiated into true leaves, stem, and root, ranging from an aggregation of filaments to a complex plantlike form. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: thallus (Thesaurus) thallous thalweg 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: recherch Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language