We found 7 dictionaries that define the word retaining walls:

General (5 matching dictionaries)

1. retaining walls: Collins English Dictionary
2. retaining walls: Vocabulary.com
3. retaining walls: Wiktionary
4. Retaining walls: Wikipedia, the Free Encyclopedia
5. Retaining walls: TheFreeDictionary.com

Business (1 matching dictionary)

6. Retaining walls: Financial dictionary

Computing (1 matching dictionary)

7. Retaining walls: Encyclopedia

(Note: See retaining_wall as well.)

Definitions from Wiktionary (retaining wall) ▸ noun:  (civil engineering) Any of several structures used to restrain a vertical-faced mass of earth. ▸ Also see retaining_wall ▸ Words similar to retaining walls ▸ Usage examples for retaining walls ▸ Idioms related to retaining walls ▸ Wikipedia articles (New!) ▸ Words that often appear near retaining walls ▸ Rhymes of retaining walls ▸ Invented words related to retaining walls