Coma (disambiguation) - Definition and Overview

• In medicine, a coma refers to a particular state of unconsciousness.
• In astronomy, a coma is part of the tail of a comet, produced by vapor boiled off the comet as it nears the sun. It is named for "hair", as is the constellation Coma Berenices.
• In optics, a coma is an optical aberration in an astronomical telescope which causes a V-shaped flare to the image of a star. About coma in an Newtonian telescope (http://www.opticalmechanics.com/about_coma.htm).
• In astronomy, sometimes "Coma" is shorthand for the constellation Coma Berenices.
• Coma is a 1978 movie starring Geneviève Bujold and Michael Douglas.
• "Coma" is a song by Guns N' Roses