(noun.) a state of deep and often prolonged unconsciousness; usually the result of disease or injury.
(noun.) (astronomy) the luminous cloud of particles surrounding the frozen nucleus of a comet; forms as the comet approaches the sun and is warmed.
(noun.) (botany) a usually terminal tuft of bracts (as in the pineapple) or tuft of hairs (especially on certain seeds).
校对:莱斯利
手打:托德