The plural of cavity is cavities.
The rule for plurals of words ending with a consonant + yis to change the y to an i and add es.
Other examples:
baby, babies
party, parties
The plurals of proper names ending with consonant + y is to just add s.
e.g.
Kennedy, Kennedys
July, Julys
A cavity means a hole or opening.
Medullary Cavity or bone cavity is also a word called fossa.
Oral Cavity
The tough, fibrous membrane, which lines the cavity of the skull and spinal column, and surrounds the brain and spinal cord; -- frequently abbreviated to dura.
3
nostril
The lung cavity is called the pleural cavity.
Catheterization is the medical term meaning insertion of a tube into a duct or cavity.
The cavity that you are referring to is know as the thoracic cavity.The ventral body cavity contains the organs in the chest and abdomen.Thoracic cavity
'Cavity' means a hollow space. Combining forms meaning 'hollow' include: cav/i, cav/o, cavern/o, concav/o. -cele is the medical terminology suffix meaning hollow cavity.
An orifice is an opening, cavity, or hole.
Pelvic
The hilum is the region of lymph tissue in the chest cavity.
synovial cavity
uterine agenesis
The meaning of peritoneal actually describes the transparent membrane that is found in the abdomen and that lines the cavity of the abdomen.
Effusion is the medical term meaning escape of fluid into a body cavity. So, for instance, escape of fluid into the pleural space is pleural effusion.
A cyst is an accumulation of fluid in a saclike cavity. A hydrocele is a collection of fluid in the scrotum.