Dictionary Home »
Medical Definitions » sinus
sinus medical definition
noun
- A depression or cavity formed by a bending or curving.
- A channel for the passage of blood or lymph, without the coats of an ordinary vessel, such as the blood passages in the gravid uterus or in the cerebral meninges.
- Any of various air-filled cavities in the bones of the skull, especially one communicating with the nostrils.
- A dilatation in a blood vessel.
- A fistula or tract leading to a pus-filled cavity.
Learn more about sinus
