We found 10 dictionaries that define the word contour lines:

General (7 matching dictionaries)

1. contour lines: Merriam-Webster
2. contour lines: Collins English Dictionary
3. contour lines: Vocabulary.com
4. contour lines: Cambridge Advanced Learner's Dictionary
5. contour lines: Wiktionary
6. Contour lines: Wikipedia, the Free Encyclopedia
7. Contour lines: TheFreeDictionary.com

Art (1 matching dictionary)

8. contour lines: ArtLex Lexicon of Visual Art Terminology

Business (1 matching dictionary)

9. Construction Term Glossary (No longer online)

Computing (1 matching dictionary)

10. Contour lines: Encyclopedia

(Note: See contour_line as well.)

Definitions from Wiktionary (contour line) ▸ noun:  (geography) A line on a map through points of equal elevation, often height above sea level. ▸ Also see contour_line ▸ Words similar to contour lines ▸ Usage examples for contour lines ▸ Idioms related to contour lines ▸ Wikipedia articles (New!) ▸ Words that often appear near contour lines ▸ Rhymes of contour lines ▸ Invented words related to contour lines