coma meaning and definition

COMA noun

Definition of coma (noun)

1. a state of deep and often prolonged unconsciousness; usually the result of disease or injury
   • synonyms: comatoseness
2. (botany) a usually terminal tuft of bracts (as in the pineapple) or tuft of hairs (especially on certain seeds)
3. (astronomy) the luminous cloud of particles surrounding the frozen nucleus of a comet; forms as the comet approaches the sun and is warmed