We found 28 dictionaries that define the word thallus:

General (19 matching dictionaries)

1. thallus: Merriam-Webster
2. thallus: Oxford Learner's Dictionaries
3. thallus: American Heritage Dictionary of the English Language
4. thallus: Collins English Dictionary
5. thallus: Vocabulary.com
6. Thallus, thallus: Wordnik
7. thallus: Wiktionary
8. thallus: Webster's New World College Dictionary, 4th Ed.
9. thallus: The Wordsmyth English Dictionary-Thesaurus
10. thallus: Infoplease Dictionary
11. thallus: Dictionary.com
12. Thallus (disambiguation), Thallus (historian), Thallus (poet), Thallus (tissue), Thallus: Wikipedia, the Free Encyclopedia
13. Thallus: Online Plain Text English Dictionary
14. thallus: Webster's Revised Unabridged, 1913 Edition
15. thallus: Rhymezone
16. Thallus: AllWords.com Multi-Lingual Dictionary
17. thallus: FreeDictionary.org
18. thallus: Mnemonic Dictionary
19. thallus: TheFreeDictionary.com

Art (1 matching dictionary)

20. An Etymological Dictionary of Classical Mythology (No longer online)

Computing (1 matching dictionary)

21. thallus: Encyclopedia

Medicine (4 matching dictionaries)

22. thallus: Merriam-Webster Medical Dictionary
23. Dorland's Illustrated Medical Dictionary (No longer online)
24. online medical dictionary (No longer online)
25. thallus: Medical dictionary

Science (3 matching dictionaries)

26. Botanical Terms (No longer online)
27. Bryological (No longer online)
28. Fishkeeping glossary (No longer online)

(Note: See thali as well.)

Definitions from Wiktionary (thallus) ▸ noun:  (botany) An undifferentiated plant body, such as in algae. ▸ noun:  (botany) Any plant body lacking vascular tissue. Similar: thallome, thallophyte, thallogen, pagina, perithallus, thalassophyte, hypothallus, prothallus, tholus, algal, more... Types: fruticose, foliose, crustose, lichen, more... Phrases: crustose thallus, more... Adjectives: lichen, vegetative, flat, same, new, like, mature, young, filamentous, entire, whole ▸ Words similar to thallus ▸ Usage examples for thallus ▸ Idioms related to thallus ▸ Wikipedia articles (New!) ▸ Popular adjectives describing thallus ▸ Words that often appear near thallus ▸ Rhymes of thallus ▸ Invented words related to thallus