We found 5 dictionaries that define the word walnut trees:

General (3 matching dictionaries)

1. walnut trees: Vocabulary.com
2. walnut-trees: Wordnik
3. walnut trees: TheFreeDictionary.com

Computing (1 matching dictionary)

4. walnut trees: Encyclopedia

Medicine (1 matching dictionary)

5. walnut trees: Medical dictionary

(Note: See walnut_tree as well.)

Definitions from WordNet (walnut tree) ▸ noun:  any of various trees of the genus Juglans ▸ Also see walnut_tree ▸ Words similar to walnut trees ▸ Usage examples for walnut trees ▸ Idioms related to walnut trees ▸ Wikipedia articles (New!) ▸ Words that often appear near walnut trees ▸ Rhymes of walnut trees ▸ Invented words related to walnut trees