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17-letter words containing t, a, c, h

  • gas chromatograph — a chromatograph used for the separation of volatile substances.
  • genetic algorithm — (GA) An evolutionary algorithm which generates each individual from some encoded form known as a "chromosome" or "genome". Chromosomes are combined or mutated to breed new individuals. "Crossover", the kind of recombination of chromosomes found in sexual reproduction in nature, is often also used in GAs. Here, an offspring's chromosome is created by joining segments choosen alternately from each of two parents' chromosomes which are of fixed length. GAs are useful for multidimensional optimisation problems in which the chromosome can encode the values for the different variables being optimised.
  • gestatorial chair — a ceremonial chair on which the pope is carried
  • get in on the act — If you get in on the act, you take part in or take advantage of something that was started by someone else.
  • gethsemane cheese — a semisoft, mild, yellow cheese from whole milk, made by Trappist monks.
  • glastonbury chair — a folding chair having legs crossed front-to-back and having arms connected to the back and to the front seat rail.
  • glymphatic system — Anatomy. the system or process by which cerebrospinal fluid moves through channels formed by glia, cleansing the mammalian brain of harmful waste.
  • go back to the pa — to abandon city life in favour of rural life
  • go for the collar — to go without a hit in a game
  • go like hot cakes — to be sold very quickly or in large quantities
  • good-time charlie — an affable, sociable, pleasure-loving man.
  • grande chartreuse — the Carthusian monastery at Grenoble, France: the chief monastery of the Carthusians until 1903.
  • grandfather clock — a pendulum floor clock having a case as tall as or taller than a person; tall-case clock; long-case clock.
  • grandmother clock — a pendulum clock similar to a grandfather's clock but shorter.
  • haematocrystallin — Alternative form of hematocrystallin.
  • haemorrhoidectomy — surgical removal of haemorrhoids
  • hairline fracture — a very fine crack in a bone
  • hamiltonian cycle — Hamiltonian problem
  • handicap register — a list of the disabled people in its area that a local authority had a duty to compile under the Chronically Sick and Disabled Persons Act 1970
  • hanging committee — a group of people that selects and hangs works of art to exhibit
  • hard nut to crack — a dry fruit consisting of an edible kernel or meat enclosed in a woody or leathery shell.
  • harmonic interval — an intervening period of time: an interval of 50 years.
  • hasbrouck heights — a borough in NE New Jersey.
  • have a thick skin — to be insensitive (or acutely sensitive) to blame, criticism, insults, etc.
  • health care proxy — a legal document in which a person can appoint someone to make decisions about medical treatment in the event that he or she is no longer mentally competent or able to communicate.
  • helicopter parent — a style of child rearing in which an overprotective mother or father discourages a child's independence by being too involved in the child's life: In typical helicopter parenting, a mother or father swoops in at any sign of challenge or discomfort.
  • hemoconcentration — an increase in the concentration of cellular elements in the blood, resulting from loss of plasma.
  • henry cabot lodge — Henry Cabot, 1850–1924, U.S. public servant and author: senator 1893–1924.
  • heptanedioic acid — pimelic acid.
  • heterochlamydeous — (of a plant) having a perianth consisting of distinct sepals and petals
  • high-carbon steel — steel containing between 0.5 and 1.5 per cent carbon
  • higher arithmetic — arithmetic (def 2).
  • histamine blocker — any of various substances that act at a specific receptor site to block certain actions of histamine.
  • histopathological — the science dealing with the histological structure of abnormal or diseased tissue; pathological histology.
  • historical method — the process of establishing general facts and principles through attention to chronology and to the evolution or historical course of what is being studied.
  • historical school — a school of economists that arose in Germany in the 19th century in reaction to the principles of the classical economists, and that maintained that the factors making up an economy are variable and develop out of social institutions.
  • historiographical — the body of literature dealing with historical matters; histories collectively.
  • ho chi minh trail — a network of jungle paths winding from North Vietnam through Laos and Cambodia into South Vietnam, used as a military route by North Vietnam to supply the Vietcong during the Vietnam War.
  • hold all the aces — If you say that someone holds all the aces, you mean that they have all the advantages in a contest or situation.
  • homeland security — national defence
  • homeopathic magic — magic that attempts to control the universe through the mimicking of a desired event, as by stabbing an image of an enemy in an effort to destroy him or her or by performing a ritual dance imitative of the growth of food in an effort to secure an abundant supply; a branch of sympathetic magic based on the belief that similar actions produce similar results.
  • homogentisic acid — an intermediate compound in the metabolism of tyrosine and of phenylalanine, found in excess in the blood and urine of persons affected with alkaptonuria.
  • horatio kitchener — Horatio Herbert (1st Earl Kitchener of Khartoum and of Broome) 1850–1916, English field marshal and statesman.
  • horticulturalists — Plural form of horticulturalist.
  • housekeeping cart — A housekeeping cart is a large metal basket on wheels which is used by a cleaner in a hotel to move clean bed linen, towels, and cleaning equipment.
  • hubble's constant — the ratio of the recessional velocity of galaxies to their distance from the sun, with current measurements of its value ranging from 50 to 100 km/sec per megaparsec.
  • human trafficking — the illegal practice of procuring or trading in human beings for the purpose of prostitution, forced labor, or other forms of exploitation.
  • hyaline cartilage — the typical, translucent form of cartilage, containing little fibrous tissue.
  • hydraulic circuit — a circuit through which water or another liquid, instead of electric current, flows, but which otherwise operates in the same way as an electric circuit
  • hydroelectrically — Using hydroelectric power.
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