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18-letter words containing a, d, r, t

  • lunitidal interval — the period of time between the moon's transit and the next high lunar tide.
  • magnetic recording — the process of recording sound or other data on magnetic tape, wire, etc.
  • make someone tired — to annoy or vex someone
  • mandelbrot, benoit — Benoit Mandelbrot
  • manhattan district — (during World War II) the code name for a unit of US army engineers established in 1942 to construct secret sites for the development of the atomic bomb
  • manufactured goods — products made by machine
  • marine underwriter — an underwriter who specializes in marine insurance
  • master boot record — (operating system, storage)   A special area on a computer's main hard disk that gives the location of the disk's boot block or bootable partition where the operating system is installed.
  • materials handling — the loading, unloading, and movement of goods, as within a factory or warehouse, especially by the aid of mechanical devices.
  • mato grosso do sul — a state of W central Brazil: formed in 1979 from part of Mato Grosso state. Capital: Campo Grande. Pop: 2 140 624 (2002). Area: 350 548 sq km (135 318 sq miles)
  • medical dictionary — a specialized dictionary covering terms used in the health professions by doctors, nurses, and others involved in allied health care services. A dictionary with authoritative spellings and definitions is a particularly crucial resource in medicine, where a misspelling or misunderstanding can have unfortunate consequences for people under care. Print dictionaries in this field may be sorted alphabetically or may be categorized according to medical specializations or by the various systems in the body, as the immune system and the respiratory system. The online Medical Dictionary on Dictionary.com allows alphabetical browsing in the combined electronic versions of more than one authoritative medical reference, insuring access to correct spellings, as well as immediate, direct access to a known search term typed into the search box on the site: A medical dictionary reveals that large numbers of medical terms are formed from the same Latin and Greek parts combined and recombined.
  • mendel's first law — the principle, originated by Gregor Mendel, stating that during the production of gametes the two copies of each hereditary factor segregate so that offspring acquire one factor from each parent.
  • mental retardation — Usually Offensive. a developmental disorder characterized in varying degrees by a subnormal ability to learn, a substantially low IQ, and impaired social adjustment.
  • metabolic syndrome — Pathology. a group of medical conditions present simultaneously in a patient, as high blood pressure, low HDL cholesterol levels, and an excess of abdominal fat, that increases a person's risk of heart disease, stroke, and diabetes. Also called insulin resistance syndrome.
  • methylated spirits — ethyl alcohol denatured with methyl alcohol for the purpose of preventing its use as an alcoholic beverage.
  • microwave detector — a device for recording the speed of a motorist
  • mid-atlantic ridge — a north-south suboceanic ridge in the Atlantic Ocean from Iceland to Antarctica on whose crest are several groups of islands; shown by plate tectonics to be the axis along which North America has split away from Eurasia, and along which South America has split away from Africa.
  • middle-of-the-road — favoring, following, or characterized by an intermediate position between two extremes, especially in politics; moderate.
  • midstream operator — A midstream operator is a company that gathers, transports, and processes natural gas or oil.
  • mineralocorticoids — Plural form of mineralocorticoid.
  • misunderestimation — (nonstandard) An inaccurate underestimation, or an act of misunderestimating.
  • mixed martial arts — Mixed martial arts is a sport in which two people fight by hitting, kicking, and holding each other, both in a standing position and on the ground.
  • modular arithmetic — arithmetic in which numbers that are congruent modulo a given number are treated as the same. Compare congruence (def 2), modulo, modulus (def 2b).
  • monophosphorylated — (biochemistry) phosphorylated with a single unit of phosphoric acid.
  • monte carlo method — a technique for numerically approximating the solution of a mathematical problem by studying the distribution of some random variable, often generated by a computer.
  • morphine addiction — the fact or condition of being addicted to morphine
  • motor torpedo boat — PT boat.
  • moving bed reactor — A moving bed reactor is a reactor in which a layer of catalyst in the form of granules is moved between a reaction area and a regeneration area.
  • muscular dystrophy — a hereditary disease characterized by gradual wasting of the muscles with replacement by scar tissue and fat, sometimes also affecting the heart.
  • national guardsman — guardsman (def 2).
  • native advertising — advertising content on a website that conforms to the design and format of the site and is integrated into the site’s usual content: native advertising that is almost indistinguishable from the paper’s news stories.
  • natural childbirth — childbirth involving little or no use of drugs or anesthesia and usually involving a program in which the mother is psychologically and physically prepared for the birth process.
  • neighborhood watch — a neighborhood surveillance program or group in which residents keep watch over one another's houses, patrol the streets, etc., in an attempt to prevent crime.
  • netherlands guiana — a former name of Suriname.
  • neural tube defect — any of a group of congenital abnormalities involving the brain and spinal cord, including spina bifida and meningocele, caused by failure of the neural tube to close properly during embryonic development.
  • neurodevelopmental — Of or pertaining to the development of neurological pathways in the brain.
  • new forest disease — an infectious eye disease causing acute eye pain in cattle
  • nominative-address — a noun naming the person to whom one is speaking.
  • non-discriminative — constituting a particular quality, trait, or difference; characteristic; notable.
  • non-understandable — capable of being understood; comprehensible.
  • nonstriated muscle — smooth muscle
  • normally aspirated — A normally aspirated or naturally aspirated engine breathes air at atmospheric pressure.
  • northeast corridor — the long, narrow strip of land between Boston, New York City, and Washington, D.C., containing many adjacent urban areas.
  • not breathe a word — to take air, oxygen, etc., into the lungs and expel it; inhale and exhale; respire.
  • numerical identity — the relation that holds between two relata when they are the selfsame entity, that is, when the terms designating them have the same reference
  • obedience training — the training of an animal, especially a dog, to obey certain commands.
  • officer of the day — an officer who has charge of the guard and prisoners on an assigned day at a military installation. Abbreviation: OD, O.D., O.O.D.
  • on delicate ground — in a situation requiring tact
  • on the danger list — critically ill in hospital
  • on the ragged edge — precariously close to loss of self-control, mental stability, etc.
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