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blackmail
blackout
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Blackpool
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blackwater fever
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blackhead

black·head [ blák hèd ] (plural black·heads)


noun 
Definition:
 
1. dark blocked pore: a small plug of dark fatty matter blocking a follicle on the skin, especially on the face

2. fowl disease: an infectious disease of turkeys and related fowl resulting in darkened head skin. It is caused by a protozoan.

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