| abrachia | (noun) the condition of having no arms | - |
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| amphibrach | (noun) a metrical unit with unstressed-stressed-unstressed syllables (e.g., `remember') | - |
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| arachnid | (noun) air-breathing arthropods characterized by simple eyes and four pairs of legs | Synonyms: arachnoid |
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| arachnoid | (noun) air-breathing arthropods characterized by simple eyes and four pairs of legs | Synonyms: arachnid |
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| (noun) the middle of the 3 meninges | Synonyms: arachnoid membrane |
| arachnophobia | (noun) a morbid fear of spiders | - |
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| azadirachtin | (noun) insecticide | - |
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| azedarach | (noun) tree of northern India and China having purple blossoms and small inedible yellow fruits; naturalized in the southern United States as a shade tree | Synonyms: azederach, China tree, chinaberry, chinaberry tree, Melia azedarach, Melia azederach, Persian lilac, pride-of-India |
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| azederach | (noun) tree of northern India and China having purple blossoms and small inedible yellow fruits; naturalized in the southern United States as a shade tree | Synonyms: azedarach, China tree, chinaberry, chinaberry tree, Melia azedarach, Melia azederach, Persian lilac, pride-of-India |
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| batrachian | (noun) any of various tailless stout-bodied amphibians with long hind limbs for leaping; semiaquatic and terrestrial species | Synonyms: anuran, frog, salientian, toad, toad frog |
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| batrachomyomachia | (noun) a silly altercation | - |
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| brachiation | (noun) swinging by the arms from branch to branch | - |
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| brachiopod | (noun) marine animal with bivalve shell having a pair of arms bearing tentacles for capturing food; found worldwide | Synonyms: lamp shell, lampshell |
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| brachistochrone | (noun) a curve between two points along which a body can move under gravity in a shorter time than for any other curve. | - |
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| brachium | (noun) (biology) a branching or armlike part of an animal | - |
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| brachycephalic | (noun) an adult with a short broad head | - |
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| brachycephalism | (noun) the quality of being brachycephalic | Synonyms: brachycephaly |
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| brachycephaly | (noun) the quality of being brachycephalic | Synonyms: brachycephalism |
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| brachydactylia | (noun) abnormal shortness of fingers and toes | Synonyms: brachydactyly |
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| brachydactyly | (noun) abnormal shortness of fingers and toes | Synonyms: brachydactylia |
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| brachyuran | (noun) typical crabs | - |
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| dibrach | (noun) a metrical unit with unstressed-unstressed syllables | Synonyms: pyrrhic |
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| drachm | (noun) a unit of apothecary weight equal to an eighth of an ounce or to 60 grains | Synonyms: drachma, dram |
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| (noun) a unit of capacity or volume in the apothecary system equal to one eighth of a fluid ounce | Synonyms: fluid drachm, fluid dram, fluidram |
| (noun) a British imperial capacity measure (liquid or dry) equal to 60 minims or 3.5516 cubic centimeters | Synonyms: fluid drachm, fluid dram, fluidram |
| drachma | (noun) formerly the basic unit of money in Greece | Synonyms: Greek drachma |
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| (noun) a unit of apothecary weight equal to an eighth of an ounce or to 60 grains | Synonyms: drachm, dram |
| earache | (noun) an ache localized in the middle or inner ear | Synonyms: otalgia |
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| hemidrachm | (noun) an ancient Greek silver coin equal to 1/2 drachm or 3 obols in value. | - |
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| huarache | (noun) a sandal with flat heels and an upper of woven leather straps | Synonyms: huaraches |
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| huaraches | (noun) a sandal with flat heels and an upper of woven leather straps | Synonyms: huarache |
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| laryngotracheobronchitis | (noun) inflammation of the larynx and trachea and bronchial passageways | - |
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| microbrachia | (noun) abnormally small arms | - |
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| orach | (noun) any of various herbaceous plants of the genus Atriplex that thrive in deserts and salt marshes | Synonyms: orache |
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| orache | (noun) any of various herbaceous plants of the genus Atriplex that thrive in deserts and salt marshes | Synonyms: orach |
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| overachievement | (noun) better than expected performance (better than might have been predicted from intelligence tests) | - |
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| overachiever | (noun) a student who attains higher standards than the IQ indicated | - |
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| parachute | (noun) rescue equipment consisting of a device that fills with air and retards your fall | Synonyms: chute |
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| parachuter | (noun) a person who jumps from aircraft using a parachute | Synonyms: parachute jumper, parachutist |
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| parachuting | (noun) descent with a parachute | Synonyms: jump |
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| parachutist | (noun) a person who jumps from aircraft using a parachute | Synonyms: parachute jumper, parachuter |
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| rachet | (noun) mechanical device consisting of a toothed wheel or rack engaged with a pawl that permits it to move in only one direction | Synonyms: ratch, ratchet |
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| rachis | (noun) the series of vertebrae forming the axis of the skeleton and protecting the spinal cord | Synonyms: back, backbone, spinal column, spine, vertebral column |
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| (noun) axis of a compound leaf or compound inflorescence | - |
| rachischisis | (noun) a not uncommon congenital defect in which a vertebra is malformed; unless several vertebrae are affected or there is myelomeningocele there are few symptoms; can be diagnosed by amniocentesis | Synonyms: schistorrhachis, spina bifida |
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| rachitis | (noun) childhood disease caused by deficiency of vitamin D and sunlight associated with impaired metabolism of calcium and phosphorus | Synonyms: rickets |
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| (noun) inflammation of the vertebral column | - |
| rhinotracheitis | (noun) a respiratory infection of the nose and throat in cattle | - |
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| sandarach | (noun) a brittle and faintly aromatic translucent resin used in varnishes | Synonyms: sandarac |
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| sprachgefuhl | (noun) an intuitive feeling for the natural idiom of a language | - |
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| tetrachlorethylene | (noun) anthelmintic agent used against hookworm and other nematodes | Synonyms: carbon dichloride, ethylene tetrachloride, tetrachloroethylene |
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| tetrachloride | (noun) any compound that contains four chlorine atoms per molecule | - |
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| tetrachloroethylene | (noun) anthelmintic agent used against hookworm and other nematodes | Synonyms: carbon dichloride, ethylene tetrachloride, tetrachlorethylene |
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| tetrachloromethane | (noun) a colorless nonflammable liquid used as a solvent for fats and oils; because of its toxicity its use as a cleaning fluid or fire extinguisher has declined | Synonyms: carbon tet, carbon tetrachloride, perchloromethane |
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| trachea | (noun) membranous tube with cartilaginous rings that conveys inhaled air from the larynx to the bronchi | Synonyms: windpipe |
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| (noun) one of the tubules forming the respiratory system of most insects and many arachnids | - |
| tracheid | (noun) long tubular cell peculiar to xylem | - |
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| tracheitis | (noun) inflammation of the trachea | - |
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| tracheobronchitis | (noun) common respiratory infection characterized by inflammation of the trachea and the bronchi | - |
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| tracheophyte | (noun) green plant having a vascular system: ferns, gymnosperms, angiosperms | Synonyms: vascular plant |
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| tracheostomy | (noun) a surgical operation that creates an opening into the trachea with a tube inserted to provide a passage for air; performed when the pharynx is obstructed by edema or cancer or other causes | Synonyms: tracheotomy |
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| tracheotomy | (noun) a surgical operation that creates an opening into the trachea with a tube inserted to provide a passage for air; performed when the pharynx is obstructed by edema or cancer or other causes | Synonyms: tracheostomy |
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| trachodon | (noun) large duck-billed dinosaur of the Cretaceous period | Synonyms: trachodont |
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| trachodont | (noun) large duck-billed dinosaur of the Cretaceous period | Synonyms: trachodon |
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| trachoma | (noun) a chronic contagious disease caused by a bacterium and marked by inflammation of the conjunctiva and cornea of the eye and the formation of scar tissue | - |
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| underachievement | (noun) poorer than expected performance (poorer than might have been predicted from intelligence tests) | - |
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| underachiever | (noun) a student who does not perform as well as expected or as well as the IQ indicates | Synonyms: nonachiever, underperformer |
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