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We found 22 dictionaries with English definitions that include the word hard hat:
Click on the first link on a line below to go directly to a page where "hard hat" is defined.

General (19 matching dictionaries)

1. hard hat: Merriam-Webster.com [home, info]
2. hard hat: Oxford Dictionaries [home, info]
3. hard-hat, hard hat: Collins English Dictionary [home, info]
4. hard hat: Vocabulary.com [home, info]
5. hard-hat: Wordnik [home, info]
6. hard hat: Cambridge Advanced Learner's Dictionary [home, info]
7. hard hat: Wiktionary [home, info]
8. hard-hat, hard hat: The Wordsmyth English Dictionary-Thesaurus [home, info]
9. hard hat: Infoplease Dictionary [home, info]
10. hard-hat, hard hat: Dictionary.com [home, info]
11. hard hat: UltraLingua English Dictionary [home, info]
12. Hard hat: Wikipedia, the Free Encyclopedia [home, info]
13. hard hat: Rhymezone [home, info]
14. hard hat: Free Dictionary [home, info]
15. hard hat: Mnemonic Dictionary [home, info]
16. hard hat: WordNet 1.7 Vocabulary Helper [home, info]
17. hard hat: LookWAYup Translating Dictionary/Thesaurus [home, info]
18. hard-hat, hard hat: Dictionary/thesaurus [home, info]

Computing (1 matching dictionary)

19. hard-hat, hard hat: Encyclopedia [home, info]

Slang (1 matching dictionary)

20. Hard Hat, The Hard Hat: Urban Dictionary [home, info]

Tech (1 matching dictionary)

21. hard hat: Oil and Gas Well Drilling and Servicing eTool [home, info]

(Note: See hard_hats for more definitions.)

Quick definitions from WordNet (hard hat) ▸ noun:  a lightweight protective helmet (plastic or metal) worn by construction workers ▸ noun:  a worker skilled in building offices or dwellings etc. ▸ Also see hard_hats ▸ Words similar to hard hat ▸ Usage examples for hard hat ▸ Words that often appear near hard hat ▸ Rhymes of hard hat ▸ Invented words related to hard hat