Definition of Horsehead Nebula in English:

Horsehead Nebula

Line breaks: Horse|head Neb¦ula
A dust nebula in the shape of a horse’s head, forming a dark silhouette against a bright emission nebula in Orion.

Definition of Horsehead Nebula in:

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Word of the day internecine
Pronunciation: ˌintərˈnesēn
destructive to both sides in a conflict