coma

Etymology 1

Borrowed from Ancient Greek κῶμα (kôma, “deep sleep”).

noun

1. A state of unconsciousness from which one may not wake up, usually induced by some form of trauma.
   go into a coma
   slip into a coma
   come out of a coma
   I wonder if a person who comes out of a coma feels refreshed and well rested. 2004, George Carlin, When Will Jesus Bring the Pork Chops?, New York: Hyperion Books, →OCLC, →OL, page 208

Etymology 2

Borrowed from Latin coma (“hair of the head”), from Ancient Greek κόμη (kómē, “hair”). of the wide-angle lens ]]

noun

1. (astronomy) A cloud of dust surrounding the nucleus of a comet.
2. (optics) A defect characterized by diffuse, pear-shaped images that in an ideal image would appear as points.
3. (botany) A tuft or bunch, such as the assemblage of branches forming the head of a tree, a cluster of bracts when empty and terminating the inflorescence of a plant, or a tuft of long hairs on certain seeds.