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Definition of Sphenoid sinus
1. Noun. (anatomy) A paranasal sinus contained within the body of the sphenoid bone. ¹
¹ Source: wiktionary.com
Medical Definition of Sphenoid sinus
1. One of the paired paranasal sinuses, located in the body of the sphenoid bone and communicating with the highest meatus of the nasal cavity on the same side. (12 Dec 1998)