~ 1 [ 'kəʊmə ]
■ noun a state of prolonged deep unconsciousness, caused especially by severe injury or illness.
Origin
C17: mod. L., from Gk kōma 'deep sleep'.
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~ 2 [ 'kəʊmə ]
■ noun ( plural ~e -mi: )
1》 Astronomy a diffuse cloud of gas and dust surrounding the nucleus of a comet.
2》 Optics aberration which causes an off-axis image to be flared like a comet.
Origin
C17: via L. from Gk komē 'hair of the head'.