21-letter words containing r, o, c, k, m, a
- benzalkonium chloride — a white or yellowish-white, water-soluble mixture of ammonium chloride derivatives having the structure C 8 H 10 NRCl, where R is a mixture of radicals ranging from C 8 H 17 – to C 18 H 37 –, that occurs as an amorphous powder or in gelatinous lumps: used chiefly as an antiseptic and a disinfectant.
- black-headed fireworm — the larva of any of several moths, as Rhopobota naevana (black-headed fireworm) which feeds on the leaves of cranberries and causes them to wither.
- book of common prayer — the official book of church services of the Church of England, until 1980, when the Alternative Service Book was sanctioned
- chequebook journalism — Chequebook journalism is the practice of paying people large sums of money for information about crimes or famous people in order to get material for newspaper articles.
- chink in one's armour — a small but fatal weakness
- crankcase compression — Crankcase compression is the method of starting some smaller two-stroke engines, where the mixture charge is compressed in a sealed crankcase by the descending piston before passing to the combustion chamber.
- dark-field microscope — ultramicroscope
- dead from the neck up — stupid or unintelligent
- medical social worker — a person who works in a hospital and is responsible for offering counselling to patients and their families and ensuring that discharged patients will receive appropriate care in the community
- meter-kilogram-second — of or relating to the system of units in which the meter, kilogram, and second are the principal units of length, mass, and time. Abbreviation: mks, MKS.
- olympic national park — a national park in NW Washington. 1323 sq. mi. (3425 sq. km).
- pick someone's brains — to obtain information or ideas from someone
- rocky mountain locust — a migratory locust, Melanoplus spretus, that occurs in North America, especially the Great Plains, where swarms cause great damage to crops and other vegetation.
- rocky mountain oyster — mountain oyster.
- s-k reduction machine — An abstract machine defined by Professor David Turner to evaluate combinator expressions represented as binary graphs. Named after the two basic combinators, S and K.
- scarlet monkey flower — any of various plants belonging to the genus Mimulus, of the figwort family, as M. cardinalis (scarlet monkey flower) having spotted flowers that resemble a face.
- stock list department — (in an American stock exchange) the department dealing with monitoring compliance with its listing requirements and rules
- to kill a mockingbird — a novel (1960) by Harper Lee.
- workers' compensation — a government-sponsored insurance system, funded by contributions from employers, for compensating employees for injury or occupational disease suffered in connection with their employment
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