We found 9 dictionaries that define the word respiratory systems:

General (6 matching dictionaries)

1. respiratory systems: Merriam-Webster
2. respiratory systems: Collins English Dictionary
3. respiratory systems: Vocabulary.com
4. respiratory systems: Cambridge Advanced Learner's Dictionary
5. respiratory systems: Wiktionary
6. Respiratory systems: Wikipedia, the Free Encyclopedia

Computing (1 matching dictionary)

7. Respiratory systems: Encyclopedia

Medicine (2 matching dictionaries)

8. respiratory systems: Merriam-Webster Medical Dictionary
9. Respiratory systems: Medical dictionary

(Note: See respiratory_system as well.)

Definitions from Wiktionary (respiratory system) ▸ noun:  (anatomy) The system of organs serving for respiration. ▸ Also see respiratory_system ▸ Words similar to respiratory systems ▸ Usage examples for respiratory systems ▸ Idioms related to respiratory systems ▸ Wikipedia articles (New!) ▸ Words that often appear near respiratory systems ▸ Rhymes of respiratory systems ▸ Invented words related to respiratory systems