18-letter words containing a, c, k, t
- a slap on the back — congratulation
- aarp probe packets — (networking) AARP packets sent out on a nonextended AppleTalk network to discover whether a randomly selected node ID is being used by any node. If not, the sending node uses the node ID. If so, it chooses a different ID and sends more AARP probe packets.
- alarm clock briton — a British worker with a moderate income, whose daily routine involves preparing children for school and going out to work
- anaphylactic shock — a severe, sometimes fatal, reaction to a substance to which a person has an extreme sensitivity, often involving respiratory difficulty and circulation failure
- aorangi-mount cook — the official name for Mount Cook
- applied kinematics — kinematics (def 2).
- arkansas toothpick — a bowie knife or similar sharp knifelike implement.
- asiatic black bear — a bear, Selenarctos thibetanus, of central and E Asia, whose coat is black with a pale V-shaped mark on the chest
- astronomical clock — a complex clock showing astronomical phenomena, such as the phases of the moon
- autokinetic effect — apparent motion of a single point of light or a small object when presented on a dark field and observed continuously.
- automatic tracking — a radar tracking system in which an automatic device uses the echo signal from the tracked object to keep the radar constantly beamed on target and to compute the range of the object.
- back end generator — (tool) (BEG) A code generator developed by H. Emmelmann et al at GMD, University Karlsruhe, Germany. Its input language is Back End Generator Language (BEGL).
- back in the saddle — at work again
- back to square one — If you are back to square one, you have to start dealing with something from the beginning again because the way you were dealing with it has failed.
- back/down to earth — If you come down to earth or back to earth, you have to face the reality of everyday life after a period of great excitement.
- bankers-acceptance — a draft or bill of exchange that a bank has accepted. Abbreviation: BA. Also called banker's acceptance. Compare acceptance (def 6).
- basket-handle arch — an arch having a symmetrical form drawn from an odd number of radii in excess of one, which increase in length from the springing toward the center.
- benchmark position — a public service job used for comparison with a similar position, such as a position in commerce, for wage settlements
- black lives matter — a political and social movement originating among African Americans, emphasizing basic human rights and racial equality for black people and campaigning against various forms of racism. Abbreviations: BLM, B.L.M.
- black-necked stork — a large Australian stork, Xenorhyncus asiaticus, having a white plumage, dark green back and tail, and red legs
- blackwater rafting — the sport of riding through underground caves on a large rubber tube
- blocking capacitor — a capacitor that blocks the passage of direct current but allows alternating current to pass
- branch to fishkill — (IBM: from the location of one of the corporation's facilities) Any unexpected jump in a program that produces catastrophic or just plain weird results. See jump off into never-never land, hyperspace.
- brute force attack — (cryptography) A method of breaking a cipher (that is, to decrypt a specific encrypted text) by trying every possible key. The quicker the brute force attack, the weaker the cipher. Feasibility of brute force attack depends on the key length of the cipher, and on the amount of computational power available to the attacker. Brute force attack is impossible against the ciphers with variable-size key, such as a one-time pad cipher.
- can stick/to stick — If you say that someone can stick something, especially a job, or if you tell them where to stick it, you are rudely refusing it or emphasizing that you do not want it or like it.
- can't take a trick — to be consistently unsuccessful or unlucky
- captain james cook — Frederick Albert, 1865–1940, U.S. physician and polar explorer.
- carisbrooke castle — a castle near Newport on the Isle of Wight: Charles I was held prisoner here from 1647 until his execution in 1649
- catalytic cracking — a method used in the petroleum industry for the cracking of petroleum by catalysis
- cathode dark space — Crookes dark space.
- catskill mountains — a mountain range in SE New York State: resort. Highest peak: Slide Mountain, 1261 m (4204 ft)
- cerenkov radiation — radiation emitted when a charged particle travels through a medium at a speed greater than the speed of light through that medium
- certification mark — a mark that certifies the origin, material, quality, mode of manufacture, accuracy, or other characteristic of a product or service: “UL” is a certification mark for appliances meeting the safety standards of Underwriters Laboratories, Inc.
- check verification — Check verification is a system that checks national databases of information about individuals to make sure that checks will be honored and fraud is not being committed.
- checkpoint charlie — a crossing between East and West Berlin during the Cold War
- chicken tetrazzini — diced chicken in a cream sauce, baked in a casserole with noodles and cheese, usually flavored with sherry.
- chickenheartedness — Alternative form of chicken-heartedness.
- christmas stocking — A Christmas stocking is a long sock which children hang up on Christmas Eve. During the night, parents fill the stocking with small presents.
- chukchi-kamchatkan — Chukotian.
- clark's nutcracker — a nutcracker, Nucifraga columbiana, of western North America, having pale gray plumage and black and white wings and tail.
- classical sanskrit — Sanskrit of an ancient period earlier than that of the Prakrits and later than Vedic.
- come back to earth — to return to reality from a fantasy or daydream
- commutation ticket — a ticket entitling the holder to travel over the same route, as on a railroad, a specified number of times at a reduced rate
- convenience market — the area of business which involves selling convenience foods
- cooking facilities — equipment necessary for cooking
- coronation chicken — a dish of cold cooked chicken in a mild creamy curry sauce
- correspondent bank — A correspondent bank is a bank that provides services such as accepting deposits for another bank.
- cracked distillate — A cracked distillate is a clear yellow liquid, mostly containing hydrocarbons, which is produced by steam cracking without a catalyst.
- crookes radiometer — a type of radiometer consisting of an evacuated glass bulb containing a set of lightweight vanes, each blackened on one side. The vanes are mounted on a vertical axis and revolve when light, or other radiant energy, falls on them
- dead-stick landing — Aeronautics, Aerospace. a landing of an airplane or space vehicle with the engine cut off.
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