10-letter words containing ack
- black bass — any of several predatory North American percoid freshwater game fishes of the genus Micropterus: family Centrarchidae (sunfishes, etc)
- black bean — an Australian leguminous tree, Castanospermum australe, having thin smooth bark and yellow or reddish flowers: used in furniture manufacture
- black bear — the common North American bear (Ursus americanus) that lives in forests and feeds mainly on roots and berries
- black belt — A black belt is worn by someone who has reached a very high standard in a sport such as judo or karate.
- black bile — one of the four bodily humours; melancholy
- black bloc — an informal grouping of militant, mainly anarchist, protesters who act together during anti-capitalism, anti-war, etc, protests, often wearing black hoods and black clothing
- black body — a hypothetical body that would be capable of absorbing all the electromagnetic radiation falling on it
- black book — a book containing the names of people to be punished, blacklisted, etc
- black caps — any of several birds having the top of the head black, as the chickadee and certain warblers, especially the Old World blackcap, Sylvia atricapilla.
- black code — any code of law that defined and especially limited the rights of former slaves after the Civil War.
- black diet — deprivation of all food and water as a punishment, often leading to death.
- black disc — a conventional black vinyl gramophone record as opposed to a compact disc
- black duck — a sooty brown, wild duck (Anas rubripes) of E North America
- black flag — a flag that is all or mostly black, esp. such a flag flown by a pirate ship
- black flux — a reducing flux consisting of finely divided carbon and potassium carbonate.
- black gang — the crew working in a stokehold of a ship.
- black gnat — a type of artificial fly, used chiefly for trout and salmon.
- black gold — petroleum
- black gram — a leguminous plant, Phaseolus mungo, whose seeds are used as food in India
- black hand — a group of Sicilian blackmailers and terrorists formed in the 1870s and operating in the US in the early 20th century
- black hawk — 1767-1838; chief of the Sauk people: leader in the Black Hawk War against the U.S. (1832)
- black heat — heat emitted by an electric element made from low-resistance thick wire that does not glow red
- black hole — Black holes are areas in space, where gravity is so strong that nothing, not even light, can escape from them. Black holes are thought to be formed by collapsed stars.
- black iris — a painting (1926) by Georgia O'Keeffe.
- black kite — a bird of prey, Milvus migrans, found in much of Eurasia
- black knot — a fungal disease of plums and cherries caused by Dibotryon morbosum, characterized by rough black knotlike swellings on the twigs and branches
- black land — a black, clayey soil.
- black lead — to colour or rub with black lead
- black list — a list of persons under suspicion, disfavor, censure, etc.: His record as an anarchist put him on the government's blacklist.
- black look — If someone gives you a black look, they look at you in a way that shows that they are very angry about something.
- black lung — pneumoconiosis of coal miners, caused by coal dust; anthracosis.
- black mark — A black mark against someone is something bad that they have done or a bad quality that they have which affects the way people think about them.
- black mass — a blasphemous travesty of the Christian Mass, performed by practitioners of black magic
- black mold — any fungus of the family Mucoraceae, especially Rhizopus nigricans, that forms a black, furry coating on foodstuffs.
- black monk — a Benedictine monk
- black opal — any opal of a dark coloration, not necessarily black
- black pope — the head of the Jesuit order (so called from the power he once possessed and from the black habit worn by the order).
- black ring — a disease of grasses, characterized by black rings surrounding the stems and blighted seeds, caused by a fungus, Balansia strangulans.
- black ruff — a large, blackish, pelagic fish, Centrolophus niger, of the Atlantic Ocean, chiefly along the coast of Europe.
- black rust — a stage in any of several diseases of cereals and grasses caused by rust fungi in which black masses of spores appear on the stems or leaves
- black sage — a shrubby Californian plant, Salvia mellifera, of the mint family, having an interrupted spike of lavender-blue or white flowers.
- black sash — (formerly, in South Africa) an organization of women opposed to apartheid
- black shag — a large dark-coloured shag, Phalacrocorax carbo novaehollandis, of Australasian waters
- black site — a secret facility used by a country's military as a prison and interrogation centre, whose existence is denied by the government
- black spot — If you describe a place, time, or part of a situation as a black spot, you mean that it is particularly bad or likely to cause problems.
- black stem — a disease of plants, characterized by blackened stems and defoliation, caused by any of several fungi, as Ascochyta imperfecta or Mycosphaerella lethalis.
- black swan — a phenomenon that occurs even though it had been thought to be impossible
- black taxi — a minibus used to transport workers from the townships to the city centres
- black tern — a small tern with a black head and body, Chlidonias niger, found on all continents except Australasia
- black titi — See under titi2 .