We found 10 dictionaries that define the word ethmoidal sinus:

General (7 matching dictionaries)

1. ethmoidal sinus: Vocabulary.com
2. ethmoidal sinus: Dictionary.com
3. Ethmoidal sinus: Wikipedia, the Free Encyclopedia
4. ethmoidal sinus: Rhymezone
5. ethmoidal sinus: FreeDictionary.org
6. ethmoidal sinus: Mnemonic Dictionary
7. ethmoidal sinus: TheFreeDictionary.com

Computing (1 matching dictionary)

8. ethmoidal sinus: Encyclopedia

Medicine (2 matching dictionaries)

9. ethmoidal sinus: Merriam-Webster Medical Dictionary
10. ethmoidal sinus: Medical dictionary

Definitions from WordNet (ethmoidal sinus) ▸ noun:  a sinus of the meatuses of the nasal cavity (behind the bridge of the nose) Opposite: sphenoidal sinus ▸ Words similar to ethmoidal sinus ▸ Usage examples for ethmoidal sinus ▸ Idioms related to ethmoidal sinus ▸ Wikipedia articles (New!) ▸ Words that often appear near ethmoidal sinus ▸ Rhymes of ethmoidal sinus ▸ Invented words related to ethmoidal sinus