21-letter words containing d, a, c, k, o
- aleksandr-nikolaevich — Alexander (Aleksandr Nikolaevich) 1899–1977, Russian pianist and composer, in the U.S.
- appendicular skeleton — the girdles and skeleton of the limbs
- as luck would have it — fortunately
- background processing — the ability of a system to perform a low-priority task while, at the same time, dealing with a main application
- background projection — the projection from the rear of previously photographed material on a translucent screen, used as background for a television or motion-picture shot.
- ball-and-socket joint — a coupling between two rods, tubes, etc, that consists of a spherical part fitting into a spherical socket, allowing free movement within a specific conical volume
- banach-tarski paradox — (mathematics) It is possible to cut a solid ball into finitely many pieces (actually about half a dozen), and then put the pieces together again to get two solid balls, each the same size as the original. This paradox is a consequence of the Axiom of Choice.
- behind someone's back — without someone's knowledge or consent
- 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.
- clone-and-hack coding — case and paste
- dark-field microscope — ultramicroscope
- dead from the neck up — stupid or unintelligent
- drop the handkerchief — a children's game in which all the players but one stand in a circle facing inward, while that one player stealthily drops a handkerchief behind a player in the circle who must pursue and attempt to catch the one who dropped the handkerchief before the latter reaches the vacated place.
- every nook and cranny — If you talk about every nook and cranny of a place or situation, you mean every part or every aspect of it.
- just a bunch of disks — (jargon, storage) (JBOD, or "Just a Bunch of Drives") A storage subsystems using multiple independent disk drives, as opposed to one form of RAID or another. For example, Unisys open storage provides JBOD in both SCSI and fibre channel interfaces.
- keyboard send receive — (hardware) (KSR) Part of a designation for a hard-copy terminal, manufactured by Teletype Corporation. The KSR range were lower cost versions of the ASR models.
- lexical decision task — an experimental task in which subjects have to decide as fast as possible whether a given letter string is a word
- luck was on sb's side — If you say that luck was on someone's side, you mean that they succeeded in something by chance as well as by their own efforts or ability.
- make a policy paid up — If you make a policy paid up, you stop making premium payments into a life policy but still leave the coverage in place.
- 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.
- packed encoding rules — (protocol, standard) (PER) ASN.1 encoding rules for producing a compact transfer syntax for data structures described in ASN.1, defined in 1994. PER provides a much more compact encoding then BER. It tries to represents the data units using the minimum number of bits. The compactness requires that the decoder knows the complete abstract syntax of the data structure to be decoded, however. Documents: ITU-T X.691, ISO 8825-2.
- red-headed woodpecker — a black and white North American woodpecker, Melanerpes erythrocephalus, having a red head and neck.
- 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.
- school of hard knocks — the experience gained from living, especially from disappointment and hard work, regarded as a means of education: The only school he ever attended was the school of hard knocks.
- stock list department — (in an American stock exchange) the department dealing with monitoring compliance with its listing requirements and rules
- the yellow brick road — the road to success or happiness (in the film the Wizard of Oz the yellow brick road leads to Oz)
- to be hard luck on sb — to be unfortunate or unlucky for someone
- to kill a mockingbird — a novel (1960) by Harper Lee.
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