A cyst due to infection by larvae of some species of the tapeworm Echinococcus.

A shadow-picture; a radiograph or X-ray photograph; a sciagram. / (physics) An optical technique of visualizing patterns of fluid flow by using differences in refractive index

(humorous) Unconscious and near death.

A group of musicians who play for the recording of an album but are not considered part of the recording artist's normal band.