Usually means: Cavity allowing airflow through skull.
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We found 45 dictionaries that define the word sinus:

General (26 matching dictionaries)
  1. sinus: Merriam-Webster.com
  2. sinus: Oxford Learner's Dictionaries
  3. sinus: American Heritage Dictionary of the English Language
  4. sinus: Collins English Dictionary
  5. sinus: Vocabulary.com
  6. Sinus, sinus: Wordnik
  7. sinus: Cambridge Advanced Learner's Dictionary
  8. sinus: Wiktionary
  9. sinus: Webster's New World College Dictionary, 4th Ed.
  10. sinus: The Wordsmyth English Dictionary-Thesaurus
  11. sinus: Infoplease Dictionary
  12. sinus: Dictionary.com
  13. sinus: Online Etymology Dictionary
  14. sinus: Cambridge Essential American English Dictionary
  15. Sinus (anatomy), Sinus (botany), Sinus (disambiguation), Sinus (trigonometry), Sinus: Wikipedia, the Free Encyclopedia
  16. Sinus: Online Plain Text English Dictionary
  17. sinus: Webster's Revised Unabridged, 1913 Edition
  18. sinus: Rhymezone
  19. Sinus: AllWords.com Multi-Lingual Dictionary
  20. sinus: Webster's 1828 Dictionary
  21. sinus: Free Dictionary
  22. sinus: Mnemonic Dictionary
  23. sinus: LookWAYup Translating Dictionary/Thesaurus
  24. sinus: Dictionary/thesaurus

Computing (1 matching dictionary)
  1. Sinus (disambiguation), sinus: Encyclopedia

Medicine (10 matching dictionaries)
  1. Dorland's Illustrated Medical Dictionary (No longer online)
  2. Sinus: MedTerms.com Medical Dictionary
  3. online medical dictionary (No longer online)
  4. Probert Encyclopaedia of Medicine (No longer online)
  5. Allergy Glossary (No longer online)
  6. DICTIONARY OF TERMS IN ORAL PHYSIOLOGY (No longer online)
  7. sinus: Dictionary of Cancer Terms
  8. Sinus (anatomy), Sinus (disambiguation), sinus, sinus-: Medical dictionary
  9. Sinus: Drug Medical Dictionary
  10. Hyperdictionary (No longer online)

Miscellaneous (1 matching dictionary)
  1. SINUS: Acronym Finder

Science (6 matching dictionaries)
  1. sinus: Glossary of Common Tree Terms
  2. Botanical Terms (No longer online)
  3. Bryological (No longer online)
  4. sinus: Nine Planets Glossary
  5. Flora of New South Wales (No longer online)
  6. SINUS: Zoom Astronomy Glossary

Tech (1 matching dictionary)
  1. Dairy Glossary (No longer online)

(Note: See sinuses as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
noun:  (anatomy, zootomy) A pouch or cavity in a bone or other tissue, especially one in the bones of the face or skull connecting with the nasal cavities (the paranasal sinus).
noun:  (anatomy) An irregular venous or lymphatic cavity, reservoir, or dilated vessel.
noun:  (physiology, attributive) Relating to or denoting the sinoatrial node of the heart or its function of regulating the heartbeat.
noun:  (pathology) An abnormal cavity or passage such as a fistula, leading from a deep-seated infection and discharging pus to the surface.
noun:  (botany) A rounded notch or depression between two lobes or teeth in the margin of a leaf or petal.
noun:  (geography) A bay of the sea; a recess in the shore.
noun:  (trigonometry) Synonym of sine.

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