We found 8 dictionaries that define the word drainage systems:

General (4 matching dictionaries)

1. drainage systems: Vocabulary.com
2. drainage systems: Wiktionary
3. Drainage systems: Wikipedia, the Free Encyclopedia
4. Drainage systems: TheFreeDictionary.com

Business (1 matching dictionary)

5. Drainage systems: Legal dictionary

Computing (1 matching dictionary)

6. Drainage systems: Encyclopedia

Medicine (1 matching dictionary)

7. Drainage systems: Medical dictionary

Science (1 matching dictionary)

8. Agricultural Thesaurus and Glossary (No longer online)

(Note: See drainage_system as well.)

Definitions from Wiktionary (drainage system) ▸ noun:  (geomorphology) pattern formed by the streams, rivers, and lakes in a particular drainage basin ▸ Also see drainage_system Phrases: Advanced Drainage Systems, more... ▸ Words similar to drainage systems ▸ Usage examples for drainage systems ▸ Idioms related to drainage systems ▸ Wikipedia articles (New!) ▸ Words that often appear near drainage systems ▸ Rhymes of drainage systems ▸ Invented words related to drainage systems