We found 12 dictionaries that define the word gas cap:

General (6 matching dictionaries)

1. gas cap: Oxford Learner's Dictionaries
2. gas-cap: Wordnik
3. gas cap: Cambridge Advanced Learner's Dictionary
4. gas cap: TheFreeDictionary.com
5. gas cap: Wiktionary

Business (1 matching dictionary)

6. gas cap: Legal dictionary

Computing (1 matching dictionary)

7. gas cap: Encyclopedia

Medicine (1 matching dictionary)

8. gas cap: Medical dictionary

Tech (3 matching dictionaries)

9. AUTOMOTIVE TERMS (No longer online)
10. Schlumberger Oilfield Glossary (No longer online)
11. Oil and Gas Well Drilling and Servicing eTool (No longer online)

Definitions from Wiktionary (gas cap) ▸ noun:  (US, automotive) The cap that closes a gas tank and may be opened to refill it. Phrases: gas cap drive, more... ▸ Words similar to gas cap ▸ Usage examples for gas cap ▸ Idioms related to gas cap ▸ Wikipedia articles (New!) ▸ Words that often appear near gas cap ▸ Rhymes of gas cap ▸ Invented words related to gas cap