We found 8 dictionaries that define the word niwa:

General (4 matching dictionaries)

1. Niwa: Wordnik
2. NIWA: Dictionary.com
3. NIWA, Niwa (disambiguation), Niwa: Wikipedia, the Free Encyclopedia
4. Niwa: Rhymezone

Miscellaneous (2 matching dictionaries)

5. NIWA: Acronym Finder
6. AbbreviationZ (No longer online)

Slang (1 matching dictionary)

7. Niwa: Urban Dictionary

Tech (1 matching dictionary)

8. DOD Dictionary of Military Terms: Joint Acronyms and Abbreviations (No longer online)

Definitions from WordNet (Niwa) ▸ name:  A surname (very rare: popularity rank in the U.S.: #35106) ▸ Words similar to niwa ▸ Usage examples for niwa ▸ Idioms related to niwa ▸ Wikipedia articles (New!) ▸ Words that often appear near niwa ▸ Rhymes of niwa ▸ Invented words related to niwa