We found 5 dictionaries that define the word giant water bugs:

General (4 matching dictionaries)

1. giant water bugs: Merriam-Webster
2. giant water bugs: Vocabulary.com
3. giant water bugs: Wiktionary
4. Giant water bugs: Wikipedia, the Free Encyclopedia

Medicine (1 matching dictionary)

5. giant water bugs: Merriam-Webster Medical Dictionary

(Note: See giant_water_bug as well.)

Definitions from Wiktionary (giant water bug) ▸ noun:  Any insect in the family Belostomatidae of large, predatory true bugs. ▸ Also see giant_water_bug ▸ Words similar to giant water bugs ▸ Usage examples for giant water bugs ▸ Idioms related to giant water bugs ▸ Wikipedia articles (New!) ▸ Words that often appear near giant water bugs ▸ Rhymes of giant water bugs ▸ Invented words related to giant water bugs