We found 9 dictionaries that define the word biological weapons:

General (5 matching dictionaries)

1. biological weapons: Collins English Dictionary
2. biological weapons: Vocabulary.com
3. biological-weapons: Wordnik
4. biological weapons: Wiktionary
5. Biological weapons: Wikipedia, the Free Encyclopedia

Computing (1 matching dictionary)

6. Biological weapons: Encyclopedia

Medicine (1 matching dictionary)

7. Biological weapons: Medical dictionary

Miscellaneous (2 matching dictionaries)

8. Army Technology Glossary (No longer online)
9. Glossary of Terrorism Terms (No longer online)

(Note: See biological_weapon as well.)

Definitions from Wiktionary (biological weapon) ▸ noun:  A biological pathogen or toxin designed or used for warfare. ▸ Also see biological_weapon Phrases: Biological Weapons Convention, United States biological weapons program, Soviet biological weapons program, Iraqi biological weapons program, Chinese biological weapons program, more... ▸ Words similar to biological weapons ▸ Usage examples for biological weapons ▸ Idioms related to biological weapons ▸ Wikipedia articles (New!) ▸ Words that often appear near biological weapons ▸ Rhymes of biological weapons ▸ Invented words related to biological weapons