Read the dictionary definition of coma. All definitions for this word.
1. a state of deep and often prolonged unconsciousness; usually the result of disease or injury
2. (astronomy) the luminous cloud of particles surrounding the frozen nucleus of a comet; forms as the comet approaches the sun and is warmed
3. (botany) a usually terminal tuft of bracts (as in the pineapple) or tuft of hairs (especially on certain seeds)