We found 31 dictionaries that define the word helical:

General (21 matching dictionaries)

1. helical: Merriam-Webster
2. helical: Oxford Learner's Dictionaries
3. helical: American Heritage Dictionary of the English Language
4. helical: Collins English Dictionary
5. helical: Vocabulary.com
6. Helical, -helical, helical: Wordnik
7. helical: Cambridge Advanced Learner's Dictionary
8. helical: Wiktionary
9. helical: Webster's New World College Dictionary, 4th Ed.
10. helical: The Wordsmyth English Dictionary-Thesaurus
11. helical: Infoplease Dictionary
12. helical: Dictionary.com
13. Helical: Wikipedia, the Free Encyclopedia
14. Helical: Online Plain Text English Dictionary
15. helical: Webster's Revised Unabridged, 1913 Edition
16. helical: Rhymezone
17. Helical: AllWords.com Multi-Lingual Dictionary
18. helical: Webster's 1828 Dictionary
19. helical: FreeDictionary.org
20. helical: TheFreeDictionary.com
21. helical: Mnemonic Dictionary

Business (1 matching dictionary)

22. helical: Legal dictionary

Computing (1 matching dictionary)

23. helical: Encyclopedia

Medicine (4 matching dictionaries)

24. helical: Merriam-Webster Medical Dictionary
25. Dorland's Illustrated Medical Dictionary (No longer online)
26. online medical dictionary (No longer online)
27. helical: Medical dictionary

Science (1 matching dictionary)

28. Bryological (No longer online)

Tech (3 matching dictionaries)

29. AUTOMOTIVE TERMS (No longer online)
30. Glossary of Composite Terms (No longer online)
31. Helical: Glossary of Insulator Terms

(Note: See helically as well.)

Definitions from Wiktionary (helical) ▸ adjective:  In the shape of a helix. Similar: voluted, spiraling, whorled, coiled, turbinate, helicoid, helictical, heliciform, helixlike, hemihelical, more... Opposite: straight, linear, non-spiral Types: right-handed, left-handed, chiral, more... Phrases: helical gears, helical spring, helical gear, Helical scan, Helical antenna, more... Adjectives: double, triple, complete, cervical, detector, unenhanced, new, multi, noncontrast, single, multidetector Colors:     silver,     steel blue,     gunmetal,     charcoal,     slate gray, more... ▸ Words similar to helical ▸ Usage examples for helical ▸ Idioms related to helical ▸ Wikipedia articles (New!) ▸ Popular nouns described by helical ▸ Words that often appear near helical ▸ Rhymes of helical ▸ Invented words related to helical