| 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 |
| 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 | - |
| 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 | - |
| 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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| 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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| 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 |
| refrain | (noun) the part of a song where a soloist is joined by a group of singers | Synonyms: chorus |
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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 |
| suzerain | (noun) a state exercising a degree of dominion over a dependent state especially in its foreign affairs | - |
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| 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 |
| woodgrain | (noun) texture produced by the fibers in wood | Synonyms: wood grain, woodiness |
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