We found 22 dictionaries that define the word helio:

General (17 matching dictionaries)

1. helio-: Merriam-Webster
2. helio-: Oxford Learner's Dictionaries
3. helio-: American Heritage Dictionary of the English Language
4. helio-, helio-: Collins English Dictionary
5. Helio, helio, helio-: Wordnik
6. helio, helio-: Wiktionary
7. helio-: Webster's New World College Dictionary, 4th Ed.
8. helio (heli-): The Wordsmyth English Dictionary-Thesaurus
9. helio: Infoplease Dictionary
10. Helio-, helio, helio-: Dictionary.com
11. Helio (Cambridge Glass), Helio (disambiguation), Helio (wireless carrier), Helio: Wikipedia, the Free Encyclopedia
12. Helio-: Online Plain Text English Dictionary
13. helio-: Webster's Revised Unabridged, 1913 Edition
14. Helio-: AllWords.com Multi-Lingual Dictionary
15. helio, helio-: MyWord.info
16. helio-: FreeDictionary.org
17. helio-: TheFreeDictionary.com

Art (1 matching dictionary)

18. helio-: A Cross Reference of Latin and Greek Elements

Medicine (1 matching dictionary)

19. online medical dictionary (No longer online)

Miscellaneous (1 matching dictionary)

20. HELIO: Acronym Finder

Science (1 matching dictionary)

21. helio: WebElements Periodic Table of the Elements

Slang (1 matching dictionary)

22. Helio: Urban Dictionary

Definitions from Wiktionary (helio) ▸ noun:  A heliotrope (surveying instrument). Similar: heliotrope, heliograph, heliographer, photoheliograph, heliotype, heliologist, heliography, heliconist, radioheliograph, photoheliography, more... Opposite: aero, aero- Types: sun, star, more... Phrases: helio oiticica, Helio Courier, Helio AU-24 Stallion, The Helio Sequence, Helio Twin Courier, more... ▸ Words similar to helio ▸ Usage examples for helio ▸ Idioms related to helio ▸ Wikipedia articles (New!) ▸ Popular adjectives describing helio ▸ Words that often appear near helio ▸ Rhymes of helio ▸ Invented words related to helio