We found 24 dictionaries that define the word I-beam:

General (16 matching dictionaries)

1. I-beam: Oxford Learner's Dictionaries
2. I-beam: American Heritage Dictionary of the English Language
3. I-beam, I-beam: Collins English Dictionary
4. I-beam: Vocabulary.com
5. I-Beam, I-beam, i-beam: Wordnik
6. I-beam: Wiktionary
7. I-beam: Webster's New World College Dictionary, 4th Ed.
8. I-beam: The Wordsmyth English Dictionary-Thesaurus
9. I-beam: Infoplease Dictionary
10. i-beam: Dictionary.com
11. I-Beam, I-beam: Wikipedia, the Free Encyclopedia
12. I-beam: Rhymezone
13. i-beam: FreeDictionary.org
14. i-beam: Mnemonic Dictionary
15. I-beam: TheFreeDictionary.com

Business (1 matching dictionary)

16. BusinessDictionary.com (No longer online)

Computing (1 matching dictionary)

17. I-beam: Encyclopedia

Miscellaneous (1 matching dictionary)

18. I-BEAM: Acronym Finder

Science (1 matching dictionary)

19. I-Beam: Eric Weisstein's World of Chemistry

Slang (1 matching dictionary)

20. I-beam: Urban Dictionary

Tech (3 matching dictionaries)

21. AUTOMOTIVE TERMS (No longer online)
22. I-beam: Construction Glossary
23. Bridge and Tunnels Terminology (No longer online)

(Note: See i-beams as well.)

Definitions from WordNet ( ) ▸ noun:  girder having a cross section resembling the letter `I' Similar: I-bar, i-breve, long i, i-stem, short i, iambic, K truss, beam, long e, tittle, more... ▸ Words similar to I-beam ▸ Usage examples for I-beam ▸ Idioms related to I-beam ▸ Wikipedia articles (New!) ▸ Popular adjectives describing I-beam ▸ Words that often appear near I-beam ▸ Rhymes of I-beam ▸ Invented words related to I-beam