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