Coma - Definition

n 1: a state of deep and often prolonged unconsciousness;
usually the result of disease or injury [syn: coma,
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