A single wall that divides two cavities is a septum. A heart has a septum dividing the right and left sides.
Pansinusitis is the medical term meaning inflammation of all the sinus cavities.
The ventricles are the fluid-filled cavities of the brain.
septum
The medical term is "visceral." It refers to structures or functions related to the internal organs within the body's cavities, such as the abdomen or thorax.
The medical term is "paranasal sinuses." These are air-filled cavities located within the bones surrounding the nasal cavity. They are important for natural drainage and humidifying the air we breathe.
Epithelial is the medical term meaning pertaining to epithelium.
Mononucleosis is the abnormal condition of a single nucleus.
Skrewed for life
There is no single term but a good sentance would be "cardiac conductance disorder"
the second suffix is ususally a single letter
Meningitis is inflammation of the three layers of tissue that surround the brain and spinal cord, collectively called the meninges; separately they are the pia mater, dura mater and subarachnoid mater.
The term for when a company divides or splits into two separate entities is called a "spin-off."