We found 10 dictionaries that define the word triangular numbers:

General (7 matching dictionaries)

1. triangular numbers: Merriam-Webster
2. triangular numbers: Wordnik
3. triangular numbers: Wiktionary
4. Triangular numbers: Dictionary.com
5. Triangular numbers: Wikipedia, the Free Encyclopedia
6. triangular numbers: FreeDictionary.org
7. Triangular numbers: TheFreeDictionary.com

Computing (1 matching dictionary)

8. triangular numbers: Encyclopedia

Science (2 matching dictionaries)

9. A Glossary of Mathematical Terms (No longer online)
10. triangular numbers: PlanetMath Encyclopedia

▸ Words similar to triangular numbers ▸ Usage examples for triangular numbers ▸ Idioms related to triangular numbers ▸ Wikipedia articles (New!) ▸ Words that often appear near triangular numbers ▸ Rhymes of triangular numbers ▸ Invented words related to triangular numbers