We found 23 dictionaries that define the word trillium:

General (19 matching dictionaries)

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

Computing (1 matching dictionary)

20. trillium: Encyclopedia

Medicine (2 matching dictionaries)

21. Medical Dictionary (No longer online)
22. online medical dictionary (No longer online)

Tech (1 matching dictionary)

23. Trillium: Printed Circuit Design and Manufacturing Glossary

(Note: See trilliums as well.)

Definitions from Wiktionary (trillium) ▸ noun:  Any of several perennial flowering plants, of the genus Trillium, having flowers with three petals Similar: wake-robin, wood lily, wakerobin, nodding trillium, trefoil, wake robin, red trillium, white trillium, trumpet flower, tritonia, more... Types: red, white, purple, great white, nodding, toothwort, wake robin, more... Phrases: white trillium, painted trillium, red trillium, purple trillium, trillium sessile, more... Adjectives: white, purple, red, flowered, painted, first, yellow, great, western, large, wild ▸ Words similar to trillium ▸ Usage examples for trillium ▸ Idioms related to trillium ▸ Wikipedia articles (New!) ▸ Popular adjectives describing trillium ▸ Words that often appear near trillium ▸ Rhymes of trillium ▸ Invented words related to trillium