We found 6 dictionaries that define the word upper surface:

General (6 matching dictionaries)

1. upper surface: Vocabulary.com
2. upper surface: Dictionary.com
3. upper surface: Rhymezone
4. upper surface: FreeDictionary.org
5. upper surface: Mnemonic Dictionary
6. upper surface: TheFreeDictionary.com

(Note: See upper_surfaces as well.)

Definitions from WordNet (upper surface) ▸ noun:  the side that is uppermost Opposite: underside, bottom, base, sole ▸ Words similar to upper surface ▸ Usage examples for upper surface ▸ Idioms related to upper surface ▸ Wikipedia articles (New!) ▸ Words that often appear near upper surface ▸ Rhymes of upper surface ▸ Invented words related to upper surface