Cavity may refer to: Biology and healthcare Body cavity, a fluid-filled space in many animals where organs typically develop Gastrovascular cavity, the primary organ of digestion and circulation in cnidarians and flatworms Dental cavity or tooth decay, damage to the structure of a tooth Lung cavity, an air-filled space within the lung Radio frequency resonance Microwave cavity or RF cavity, a cavity resonator in the radio frequency range, for example used in particle accelerators Optical cavity, the cavity resonator of a laser Resonant cavity, a device designed to select for waves of particular wavelengths Other uses Cavity (band), a sludge metal band from Miami, Florida Cavity method, a mathematical method to solve some mean field type of models Cavity wall, a wall consisting of two skins with a cavity See also Cavitation, the phenomenon of partial vacuums forming in fluid, for example, in propellers Cavitary pneumonia, a type of pneumonia in which a hole is formed in the lung Cavity Search (disambiguation) Hollow (disambiguation)