/blak"hed'/, n.
1. a small, black-tipped, fatty mass in a skin follicle, esp. of the face; comedo.
2. any of several birds having a black head, as the greater scaup, Aythya marila.
3. Also called enterohepatitis. Vet. Pathol. a malignant, infectious disease of turkeys, chickens, and many wild birds, caused by a protozoan parasite, Histomonas meleagridas, attacking esp. the intestines and liver, and often characterized by a darkening of the skin on the head.
[1650-60; BLACK + HEAD]

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▪ bird disease
also called  histomoniasis,  

      acute liver and intestinal (intestine) disease of turkeys (turkey), chickens (chicken), and other game birds, caused by the protozoan parasite Histomonas meleagridis that lives in eggs of the nematode Heterakis gallinarum. Chief symptoms are listlessness and sulfur-coloured diarrhea. Blackhead is usually fatal in turkeys.

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Universalium. 2010.

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Look at other dictionaries:

  • Blackhead — bezeichnet Blackhead Range, einen Gebirgszug in den nördlichen Catskills von New York, USA. Blackhead Mountain, einen Berggipfel in der Blackhead Range Blackhead Point, auch Tai Pau Mai, ein Kap in Hong Kong. Blackhead (Kanada) in Kanada… …   Deutsch Wikipedia

  • Blackhead — Black head , n. (Zo[ o]l.) The scaup duck. [1913 Webster] …   The Collaborative International Dictionary of English

  • Blackhead —   [ blækhed, englisch], Tiermedizin: Typhlohepatitis …   Universal-Lexikon

  • blackhead — comedo, 1837, from BLACK (Cf. black) (adj.) + HEAD (Cf. head) (n.). So called for its appearance …   Etymology dictionary

  • blackhead — ► NOUN ▪ a plug of oily matter in a hair follicle …   English terms dictionary

  • blackhead — [blak′hed΄] n. 1. any of various black headed birds, esp. the scaup duck 2. a black tipped plug of dried fatty matter in a pore of the skin ☆ 3. an infectious disease of the intestines and liver of turkeys, chickens, etc. caused by a protozoan… …   English World dictionary

  • Blackhead — This article is about the skin condition. For other uses, see Blackhead (disambiguation). Blackhead Classification and external resources Blackheads on a nose. ICD 9 …   Wikipedia

  • blackhead — UK [ˈblækˌhed] / US noun [countable] Word forms blackhead : singular blackhead plural blackheads a small black spot on your skin, caused by dirt or oil blocking a pore (= one of the small holes in your skin) …   English dictionary

  • blackhead — Scaup Scaup (sk[add]p), n. [See {Scalp} a bed of oysters or mussels.] 1. A bed or stratum of shellfish; scalp. [Scot.] [1913 Webster] 2. (Zo[ o]l.) A scaup duck. See below. [1913 Webster] {Scaup duck} (Zo[ o]l.), any one of several species of… …   The Collaborative International Dictionary of English

  • blackhead — Broadbill Broad bill , n. 1. (Zo[ o]l.) A wild duck ({Aythya marila}, or {Fuligula marila}), which appears in large numbers on the eastern coast of the United States, in autumn; called also {bluebill}, {blackhead}, {raft duck}, and {scaup duck}.… …   The Collaborative International Dictionary of English

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