As a noun 'Sinus' . it plural is 'Sinii'. NOT 'sinuses' , which refers to a verb.
Many English language nouns ending is 'us' as the singular. have ' --ii' as plurtal.
e.g.
Radius / Radii
Focus / Foci
Hence Sinus / Sinii
Sinuses
The plural of trick is tricks.
The noun cot has a regular plural, cots.
The plural form of the noun torches. The plural possessive form is torches'.Example: After dark, the torches' lights of many skiers twinkled down the mountain.
= trapizii
Sinuses
The plural of "sinus" in Latin is "sina." In anatomical and medical contexts, however, it is often retained in its Latin form "sinuses" when referring to multiple sinus cavities in the body.
paranasal sinus include frontal sinus, the maxillary sinus, the ethmodial sinuses, and the spheniodal sinus.
The maxillary sinus
paranasal sinus include frontal sinus, the maxillary sinus, the ethmodial sinuses, and the spheniodal sinus.
Some words with the root sinus include sinusitis (inflammation of the sinuses), sinusoid (having a sinus-like curve), and sinusoidal (relating to a sinus).
In health, be sure you are talking about the correct "sinus" The heart has a sinus, so please be specific about which sinus you are referring to.
The maxillary sinus
Thrombosis: Blood clot Sinus: A sack/avity in an organ or tissue deep sinus thrombosis: a deep bloodclot in a sinus...
no
Take sinus relief medication
Sinus nodes (sa nodes)