coma

noun4

1. •
   a deep sleep-like condition, often after a bad accident or illness, which a person may never come out of

   • I wonder if a person who comes out of a coma feels refreshed and well rested. — 2004
2. •
   A cloud of dust surrounding the nucleus of a comet.
3. •
   A defect characterized by diffuse, pear-shaped images that in an ideal image would appear as points.
4. •
   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.