后发星座

[ noun ]
a constellation in the northern hemisphere between Ursa Major and Bootes; contains a cluster of some 10,000 galaxies
<noun.object>

Coma \Co"ma\, n. [L., hair, fr. Gr. ko`mh.]
1. (Astron.) The envelope of a comet; a nebulous covering,
which surrounds the nucleus or body of a comet.

2. (Bot.) A tuft or bunch, -- as the assemblage of branches
forming the head of a tree; or a cluster of bracts when
empty and terminating the inflorescence of a plant; or a
tuft of long hairs on certain seeds.

{Coma Berenices}[L.] (Astron.), a small constellation north
of Virgo; -- called also {Berenice's Hair}.