| betweenbrain | (noun) the posterior division of the forebrain; connects the cerebral hemispheres with the mesencephalon | Synonyms: diencephalon, interbrain, thalmencephalon |
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| birdbrain | (noun) a person with confused ideas; incapable of serious thought | Synonyms: addle-head, addlehead, loon |
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| brain | (noun) that part of the central nervous system that includes all the higher nervous centers; enclosed within the skull; continuous with the spinal cord | Synonyms: encephalon |
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| (noun) mental ability | Synonyms: brainpower, learning ability, mental capacity, mentality, wit |
| (noun) that which is responsible for one's thoughts, feelings, and conscious brain functions; the seat of the faculty of reason | Synonyms: head, mind, nous, psyche |
| (noun) the brain of certain animals used as meat | - |
| (noun) someone who has exceptional intellectual ability and originality | Synonyms: brainiac, Einstein, genius, mastermind |
| braincase | (noun) the part of the skull that encloses the brain | Synonyms: brainpan, cranium |
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| brainchild | (noun) a product of your creative thinking and work | Synonyms: inspiration |
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| brainiac | (noun) someone who has exceptional intellectual ability and originality | Synonyms: brain, Einstein, genius, mastermind |
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| brainpan | (noun) the part of the skull that encloses the brain | Synonyms: braincase, cranium |
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| brainpower | (noun) mental ability | Synonyms: brain, learning ability, mental capacity, mentality, wit |
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| brainstem | (noun) the part of the brain continuous with the spinal cord and comprising the medulla oblongata and pons and midbrain and parts of the hypothalamus | Synonyms: brain-stem, brain stem |
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| brainstorm | (noun) the clear (and often sudden) understanding of a complex situation | Synonyms: brainwave, insight |
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| brainstorming | (noun) a group problem-solving technique in which members spontaneously share ideas and solutions | - |
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| brainwashing | (noun) forcible indoctrination into a new set of attitudes and beliefs | - |
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| brainwave | (noun) the clear (and often sudden) understanding of a complex situation | Synonyms: brainstorm, insight |
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| (noun) (neurophysiology) rapid fluctuations of voltage between parts of the cerebral cortex that are detectable with an electroencephalograph | Synonyms: brain wave, cortical potential |
| brainworker | (noun) someone whose profession involves using his head to solve problems | Synonyms: brain-worker |
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| constraint | (noun) the act of constraining; the threat or use of force to control the thoughts or behavior of others | - |
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| (noun) a device that retards something's motion | Synonyms: restraint |
| (noun) the state of being physically constrained | Synonyms: restraint |
| contraindication | (noun) (medicine) a reason that makes it inadvisable to prescribe a particular drug or employ a particular procedure or treatment | - |
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| distraint | (noun) the seizure and holding of property as security for payment of a debt or satisfaction of a claim | Synonyms: distress |
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| drain | (noun) emptying something accomplished by allowing liquid to run out of it | Synonyms: drainage |
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| (noun) a gradual depletion of energy or resources | - |
| (noun) a pipe through which liquid is carried away | Synonyms: drainpipe, waste pipe |
| (noun) tube inserted into a body cavity (as during surgery) to remove unwanted material | - |
| drainage | (noun) emptying something accomplished by allowing liquid to run out of it | Synonyms: drain |
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| drainboard | (noun) a board beside a kitchen sink and inclined to drain into the sink | Synonyms: draining board |
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| drainpipe | (noun) a pipe through which liquid is carried away | Synonyms: drain, waste pipe |
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| drainplug | (noun) a removable plug for holding water in a tub or basin | - |
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| eyestrain | (noun) a tiredness of the eyes caused by prolonged close work by a person with an uncorrected vision problem | Synonyms: asthenopia |
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| forebrain | (noun) the anterior portion of the brain; the part of the brain that develops from the anterior part of the neural tube | Synonyms: prosencephalon |
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| geartrain | (noun) wheelwork consisting of a connected set of rotating gears by which force is transmitted or motion or torque is changed | Synonyms: gear, gearing, power train, train |
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| grain | (noun) the direction, texture, or pattern of fibers found in wood or leather or stone or in a woven fabric | - |
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| (noun) the physical composition of something (especially with respect to the size and shape of the small constituents of a substance) | Synonyms: texture |
| (noun) the smallest possible unit of anything | - |
| (noun) foodstuff prepared from the starchy grains of cereal grasses | Synonyms: cereal, food grain |
| (noun) a relatively small granular particle of a substance | - |
| (noun) dry seed-like fruit produced by the cereal grasses: e.g. wheat, barley, Indian corn | Synonyms: caryopsis |
| (noun) a cereal grass | - |
| (noun) 1/7000 pound; equals a troy grain or 64.799 milligrams | - |
| (noun) 1/60 dram; equals an avoirdupois grain or 64.799 milligrams | - |
| (noun) a weight unit used for pearls or diamonds: 50 mg or 1/4 carat | Synonyms: metric grain |
| (noun) the side of leather from which the hair has been removed | - |
| grainfield | (noun) a field where grain is grown | Synonyms: grain field |
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| graininess | (noun) the quality of being composed of relatively large particles | Synonyms: coarseness, granularity |
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| graining | (noun) a texture like that of wood | Synonyms: woodgraining |
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| grosgrain | (noun) a silk or silklike fabric with crosswise ribs | - |
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| hindbrain | (noun) the posterior portion of the brain including cerebellum and brainstem | Synonyms: rhombencephalon |
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| ingraining | (noun) teaching or impressing upon the mind by frequent instruction or repetition | Synonyms: inculcation, instilling |
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| interbrain | (noun) the posterior division of the forebrain; connects the cerebral hemispheres with the mesencephalon | Synonyms: betweenbrain, diencephalon, thalmencephalon |
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| midbrain | (noun) the middle portion of the brain | Synonyms: mesencephalon |
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| migraine | (noun) a severe recurring vascular headache; occurs more frequently in women than men | Synonyms: hemicrania, megrim, sick headache |
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| moraine | (noun) accumulated earth and stones deposited by a glacier | - |
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| murrain | (noun) any disease of domestic animals that resembles a plague | - |
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| overstrain | (noun) too much strain | - |
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| quatrain | (noun) a stanza of four lines | - |
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| rain | (noun) anything happening rapidly or in quick successive | Synonyms: pelting |
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| (noun) water falling in drops from vapor condensed in the atmosphere | Synonyms: rainfall |
| (noun) drops of fresh water that fall as precipitation from clouds | Synonyms: rainwater |
| rainbow | (noun) an illusory hope | - |
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| (noun) an arc of colored light in the sky caused by refraction of the sun's rays by rain | - |
| raincoat | (noun) a water-resistant coat | Synonyms: waterproof |
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| raindrop | (noun) a drop of rain | - |
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| rainfall | (noun) water falling in drops from vapor condensed in the atmosphere | Synonyms: rain |
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| rainfly | (noun) flap consisting of a piece of canvas that can be drawn back to provide entrance to a tent | Synonyms: fly, fly sheet, tent-fly, tent flap |
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| rainforest | (noun) a forest with heavy annual rainfall | Synonyms: rain forest |
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| raininess | (noun) (of weather) the badness of the weather | Synonyms: foulness |
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| rainlessness | (noun) The state or condition of being rainless; lack of rain; drought. | - |
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| rainmaker | (noun) American Indian medicine man who attempt to make it rain | - |
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| (noun) executive who is very successful in bringing in business to his company or firm | - |
| rainmaking | (noun) activity intended to produce rain | - |
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| rainstorm | (noun) a storm with rain | - |
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| rainwater | (noun) drops of fresh water that fall as precipitation from clouds | Synonyms: rain |
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| refrain | (noun) the part of a song where a soloist is joined by a group of singers | Synonyms: chorus |
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| restrainer | (noun) a person who directs and restrains | Synonyms: controller |
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| (noun) a chemical that is added to a photographic developer in order to retard development and reduce the amount of fog on a film | - |
| restraint | (noun) the act of controlling by restraining someone or something | - |
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| (noun) a device that retards something's motion | Synonyms: constraint |
| (noun) discipline in personal and social activities | Synonyms: control |
| (noun) lack of ornamentation | Synonyms: chasteness, simpleness, simplicity |
| (noun) a rule or condition that limits freedom | - |
| (noun) the state of being physically constrained | Synonyms: constraint |
| retraining | (noun) training for a new occupation | - |
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| scatterbrain | (noun) a flighty and disorganized person | Synonyms: forgetful person |
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| sprain | (noun) a painful injury to a joint caused by a sudden wrenching of its ligaments | - |
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| strain | (noun) an effortful attempt to attain a goal | Synonyms: nisus, pains, striving |
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| (noun) the act of singing | Synonyms: song |
| (noun) an intense or violent exertion | Synonyms: straining |
| (noun) the general meaning or substance of an utterance | Synonyms: tenor |
| (noun) a succession of notes forming a distinctive sequence | Synonyms: air, line, melodic line, melodic phrase, melody, tune |
| (noun) a special variety of domesticated animals within a species | Synonyms: breed, stock |
| (noun) (biology) a group of organisms within a species that differ in trivial ways from similar groups | Synonyms: form, var., variant |
| (noun) (physics) deformation of a physical body under the action of applied forces | - |
| (noun) injury to a muscle (often caused by overuse); results in swelling and pain | - |
| (noun) (psychology) nervousness resulting from mental stress | Synonyms: mental strain, nervous strain |
| (noun) difficulty that causes worry or emotional tension | Synonyms: stress |
| strainer | (noun) a filter to retain larger pieces while smaller pieces and liquids pass through | - |
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| straining | (noun) the act of distorting something so it seems to mean something it was not intended to mean | Synonyms: distortion, overrefinement, torture, twisting |
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| (noun) an intense or violent exertion | Synonyms: strain |
| suprainfection | (noun) secondary infection caused by an opportunistic infection | - |
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| suzerain | (noun) a state exercising a degree of dominion over a dependent state especially in its foreign affairs | - |
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| suzerainty | (noun) the domain of a suzerain | - |
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| (noun) the position or authority of a suzerain | - |
| terrain | (noun) a piece of ground having specific characteristics or military potential | - |
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| train | (noun) public transport provided by a line of railway cars coupled together and drawn by a locomotive | Synonyms: railroad train |
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| (noun) wheelwork consisting of a connected set of rotating gears by which force is transmitted or motion or torque is changed | Synonyms: gear, gearing, geartrain, power train |
| (noun) piece of cloth forming the long back section of a gown that is drawn along the floor | - |
| (noun) a series of consequences wrought by an event | - |
| (noun) a procession (of wagons or mules or camels) traveling together in single file | Synonyms: caravan, wagon train |
| (noun) a sequentially ordered set of things or events or ideas in which each successive member is related to the preceding | Synonyms: string |
| trainband | (noun) a company of militia in England or America from the 16th century to the 18th century | - |
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| trainbandsman | (noun) a member of a trainband | - |
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| trainbearer | (noun) one who holds up the train of a gown or robe on a ceremonial occasion | - |
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| trainee | (noun) someone who is being trained | - |
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| traineeship | (noun) financial aid that enables you to get trained for a specified job | - |
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| trainer | (noun) simulator consisting of a machine on the ground that simulates the conditions of flying a plane | Synonyms: flight simulator |
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| (noun) one who trains other persons or animals | - |
| training | (noun) activity leading to skilled behavior | Synonyms: grooming, preparation |
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| (noun) the result of good upbringing (especially knowledge of correct social behavior) | Synonyms: breeding, education |
| trainload | (noun) quantity that can be carried by a train | - |
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| trainman | (noun) an employee of a railroad | Synonyms: railroad man, railroader, railway man, railwayman |
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| trainmaster | (noun) a railroad employer who is in charge of a railway yard | Synonyms: train dispatcher, yardmaster |
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| unconstraint | (noun) the trait of lacking restraint or control; reckless freedom from inhibition or worry | Synonyms: abandon, wantonness |
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| unrestraint | (noun) the quality of lacking restraint | - |
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| woodgrain | (noun) texture produced by the fibers in wood | Synonyms: wood grain, woodiness |
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| woodgraining | (noun) a texture like that of wood | Synonyms: graining |
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