| acanthocephalan | (noun) any of various worms living parasitically in intestines of vertebrates having a retractile proboscis covered with many hooked spines | Synonyms: spiny-headed worm |
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| acephalia | (noun) absence of the head (as in the development of some monsters) | Synonyms: acephalism, acephaly |
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| acephalism | (noun) absence of the head (as in the development of some monsters) | Synonyms: acephalia, acephaly |
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| acephaly | (noun) absence of the head (as in the development of some monsters) | Synonyms: acephalia, acephalism |
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| acrocephaly | (noun) a congenital abnormality of the skull; the top of the skull assumes a cone shape | Synonyms: oxycephaly |
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| acromphalus | (noun) abnormal protrusion of the navel; sometimes the start of umbilical hernia | - |
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| amorphophallus | (noun) any plant of the genus Amorphophallus | - |
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| anencephalia | (noun) a defect in brain development resulting in small or missing brain hemispheres | Synonyms: anencephaly |
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| anencephaly | (noun) a defect in brain development resulting in small or missing brain hemispheres | Synonyms: anencephalia |
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| apocryphalness | (noun) The property of being of doubtful authenticity, of lacking authority, or of not being regarded as canonical. | - |
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| (noun) The property of being of dubious veracity; of questionable accuracy or truthfulness. | - |
| asphalt | (noun) a dark bituminous substance found in natural beds and as residue from petroleum distillation; consists mainly of hydrocarbons | Synonyms: mineral pitch |
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| (noun) mixed asphalt and crushed gravel or sand; used especially for paving but also for roofing | - |
| behalf | (noun) as the agent of or on someone's part (usually expressed as `on behalf of' rather than `in behalf of') | - |
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| (noun) for someone's benefit (usually expressed as `in behalf' rather than `on behalf' and usually with a possessive) | - |
| betrothal | (noun) the act of becoming betrothed or engaged | Synonyms: espousal |
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| (noun) a mutual promise to marry | Synonyms: engagement, troth |
| 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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| breathalyser | (noun) a device that measures chemicals (especially the alcohol content) in a person's expired breath | Synonyms: breathalyzer |
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| breathalyzer | (noun) a device that measures chemicals (especially the alcohol content) in a person's expired breath | Synonyms: breathalyser |
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| cachalot | (noun) large whale with a large cavity in the head containing spermaceti and oil; also a source of ambergris | Synonyms: black whale, Physeter catodon, sperm whale |
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| catchall | (noun) an enclosure or receptacle for odds and ends | - |
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| cephalalgia | (noun) pain in the head caused by dilation of cerebral arteries or muscle contractions or a reaction to drugs | Synonyms: head ache, headache |
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| cephalaspid | (noun) extinct jawless fish of the Devonian with armored head | Synonyms: osteostracan |
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| cephalexin | (noun) a cephalosporin antibiotic (trade names Keflex and Keflin and Keftab) commonly prescribed for mild to moderately severe infections of the skin or ears or throat or lungs or urinary tract | Synonyms: Keflex, Keflin, Keftab |
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| cephalhematoma | (noun) a collection of blood under the scalp of a newborn; caused by pressure during birth | Synonyms: cephalohematoma |
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| cephalitis | (noun) inflammation of the brain usually caused by a virus; symptoms include headache and neck pain and drowsiness and nausea and fever (`phrenitis' is no longer in scientific use) | Synonyms: encephalitis, phrenitis |
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| cephalochordate | (noun) fish-like animals having a notochord rather than a true spinal column | - |
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| cephaloglycin | (noun) antibiotic related to cephalosporin but no longer in common use | Synonyms: Kafocin |
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| cephalohematoma | (noun) a collection of blood under the scalp of a newborn; caused by pressure during birth | Synonyms: cephalhematoma |
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| cephalometry | (noun) measurement of human heads | - |
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| cephalopod | (noun) marine mollusk characterized by well-developed head and eyes and sucker-bearing tentacles | Synonyms: cephalopod mollusk |
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| cephaloridine | (noun) a broad spectrum semisynthetic antibiotic produced by modifying cephalosporin | - |
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| cephalosporin | (noun) one of several broad spectrum antibiotic substances obtained from fungi and related to penicillin (trade names Mefoxin); addition of side chains has produced semisynthetic antibiotics with greater antibacterial activity | Synonyms: Mefoxin |
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| cephalothin | (noun) a semisynthetic analogue of cephalosporin | - |
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| chachalaca | (noun) slender arboreal guan resembling a wild turkey; native to Central America and Mexico; highly regarded as game birds | - |
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| chalaza | (noun) one of two spiral bands of tissue connecting the egg yolk to the enclosing membrane at either end of the shell | - |
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| (noun) basal part of a plant ovule opposite the micropyle; where integument and nucellus are joined | - |
| chalazion | (noun) a small sebaceous cyst of the eyelid resulting when a Meibomian gland is blocked | Synonyms: Meibomian cyst |
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| chalcanthite | (noun) hydrated blue crystalline form of copper sulfate | Synonyms: blue copperas, blue stone, blue vitriol |
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| chalcedony | (noun) a milky or greyish translucent to transparent quartz | Synonyms: calcedony |
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| chalcid | (noun) any of various tiny insects whose larvae are parasites on eggs and larvae of other insects; many are beneficial in destroying injurious insects | Synonyms: chalcid fly, chalcid wasp, chalcidfly |
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| chalcidfly | (noun) any of various tiny insects whose larvae are parasites on eggs and larvae of other insects; many are beneficial in destroying injurious insects | Synonyms: chalcid, chalcid fly, chalcid wasp |
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| chalcocite | (noun) a heavy grey mineral that is an ore of copper | Synonyms: copper glance |
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| chalcopyrite | (noun) a yellow copper ore (CuFeS2) made up of copper and iron sulfide | Synonyms: copper pyrites |
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| chaldron | (noun) a British imperial capacity measure (liquid or dry) equal to 36 bushels | - |
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| chalet | (noun) a Swiss house with a sloping roof and wide eaves or a house built in this style | - |
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| chalice | (noun) a bowl-shaped drinking vessel; especially the Eucharistic cup | Synonyms: goblet |
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| chalk | (noun) a piece of calcite or a similar substance, usually in the shape of a crayon, that is used to write or draw on blackboards or other flat surfaces | - |
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| (noun) an amphetamine derivative (trade name Methedrine) used in the form of a crystalline hydrochloride; used as a stimulant to the nervous system and as an appetite suppressant | Synonyms: chicken feed, crank, deoxyephedrine, glass, ice, meth, methamphetamine, methamphetamine hydrochloride, Methedrine, shabu, trash |
| (noun) a pure flat white with little reflectance | - |
| (noun) a soft whitish calcite | - |
| chalkboard | (noun) sheet of slate; for writing with chalk | Synonyms: blackboard |
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| chalkpit | (noun) a quarry for chalk | Synonyms: chalk pit |
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| chalkstone | (noun) a deposit of urates around a joint or in the external ear; diagnostic of advanced or chronic gout | Synonyms: tophus |
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| challah | (noun) (Judaism) a loaf of white bread containing eggs and leavened with yeast; often formed into braided loaves and glazed with eggs before baking | Synonyms: hallah |
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| challenge | (noun) a call to engage in a contest or fight | - |
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| (noun) questioning a statement and demanding an explanation | - |
| (noun) a formal objection to the selection of a particular person as a juror | - |
| (noun) a demand by a sentry for a password or identification | - |
| (noun) a demanding or stimulating situation | - |
| challenger | (noun) the contestant you hope to defeat | Synonyms: competition, competitor, contender, rival |
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| challis | (noun) a soft lightweight fabric (usually printed) | - |
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| chalybite | (noun) iron ore in the form of ferrous carbonate | Synonyms: siderite |
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| chlorthalidone | (noun) a diuretic (trade names Hygroton and Thalidone) used to control hypertension and conditions that cause edema; effective in lowering blood pressure to prevent heart attacks | Synonyms: Hygroton, Thalidone |
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| clinocephalism | (noun) a congenital defect in which the top of the head is depressed (concave instead of convex) | Synonyms: clinocephaly |
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| clinocephaly | (noun) a congenital defect in which the top of the head is depressed (concave instead of convex) | Synonyms: clinocephalism |
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| dhal | (noun) tropical woody herb with showy yellow flowers and flat pods; much cultivated in the tropics | Synonyms: cajan pea, Cajanus cajan, catjang pea, dahl, pigeon-pea plant, pigeon pea, red gram |
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| diencephalon | (noun) the posterior division of the forebrain; connects the cerebral hemispheres with the mesencephalon | Synonyms: betweenbrain, interbrain, thalmencephalon |
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| dolichocephalic | (noun) an adult with a long narrow head | - |
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| dolichocephalism | (noun) the quality of being dolichocephalic | Synonyms: dolichocephaly |
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| dolichocephaly | (noun) the quality of being dolichocephalic | Synonyms: dolichocephalism |
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| echoencephalogram | (noun) a graphical image of the brain produced by an echoencephalograph | - |
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| echoencephalograph | (noun) a sonograph that creates an image of the brain and its abnormalities | - |
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| echoencephalography | (noun) a noninvasive diagnostic procedure that uses ultrasound to study the anatomy of the brain | - |
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| electroencephalogram | (noun) a graphical record of electrical activity of the brain; produced by an electroencephalograph | Synonyms: EEG, encephalogram |
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| electroencephalograph | (noun) medical instrument that records electric currents generated by the brain | - |
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| encephalartos | (noun) any of numerous cycads of the genus Encephalartos having stout cylindrical trunks and a terminal crown of long often spiny pinnate leaves | - |
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| encephalitis | (noun) inflammation of the brain usually caused by a virus; symptoms include headache and neck pain and drowsiness and nausea and fever (`phrenitis' is no longer in scientific use) | Synonyms: cephalitis, phrenitis |
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| encephalocele | (noun) protrusion of brain tissue through a congenital fissure in the skull | - |
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| encephalogram | (noun) an X ray of the brain made by replacing spinal fluid with a gas (usually oxygen) to improve contrast | Synonyms: pneumoencephalogram |
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| (noun) a graphical record of electrical activity of the brain; produced by an electroencephalograph | Synonyms: EEG, electroencephalogram |
| encephalograph | (noun) Any apparatus used to produce an encephalogram by recording electric currents generated by the brain. | - |
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| encephalography | (noun) roentgenography of the brain after spinal fluid has been replaced by a gas (usually oxygen); produces an encephalogram | - |
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| encephalomeningitis | (noun) inflammation of the brain and spinal cord and their meninges | Synonyms: cerebromeningitis, meningoencephalitis |
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| encephalomyelitis | (noun) inflammation of the brain and spinal cord | - |
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| encephalon | (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: brain |
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| encephalopathy | (noun) any disorder or disease of the brain | Synonyms: brain disease, brain disorder |
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| enkephalin | (noun) an endorphin having opiate qualities that occurs in the brain and spinal cord and elsewhere | - |
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| enthalpy | (noun) (thermodynamics) a thermodynamic quantity equal to the internal energy of a system plus the product of its volume and pressure | Synonyms: H, heat content, total heat |
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| epithalamium | (noun) an ode honoring a bride and bridegroom | - |
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| eschalot | (noun) type of onion plant producing small clustered mild-flavored bulbs used as seasoning | Synonyms: Allium ascalonicum, Allium cepa aggregatum, multiplier onion, shallot |
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| exhalation | (noun) the act of expelling air from the lungs | Synonyms: breathing out, expiration |
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| (noun) exhaled breath | Synonyms: halitus |
| exomphalos | (noun) an umbilical hernia at birth in which some abdominal organs push into the umbilical cord | - |
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| exophthalmos | (noun) protrusion of the eyeball from the socket | - |
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| gildhall | (noun) the meeting place of a medieval guild | - |
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| guildhall | (noun) the hall of a guild or corporation | - |
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| halal | (noun) (Islam) meat from animals that have been slaughtered in the prescribed way according to the shariah | - |
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| halberd | (noun) a pike fitted with an ax head | - |
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| halberdier | (noun) a guard who carries a halberd (as a symbol of his duty) | - |
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| halcyon | (noun) a mythical bird said to breed at the time of the winter solstice in a nest floating on the sea and to have the power of calming the winds and waves | - |
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| haleness | (noun) a state of robust good health | Synonyms: wholeness |
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| haler | (noun) 100 halers equal 1 koruna in Czech Republic | Synonyms: heller |
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| (noun) 100 halers equal 1 koruna Slovakia | Synonyms: heller |
| half | (noun) one of two equal parts of a divisible whole | Synonyms: one-half |
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| (noun) one of two divisions into which some games or performances are divided: the two divisions are separated by an interval | - |
| halfback | (noun) (American football) the position of a back on a football team, generally smaller in size than a fullback | - |
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| (noun) (football) the running back who plays the offensive halfback position | - |
| halfbeak | (noun) tropical and subtropical marine and freshwater fishes having an elongated body and long protruding lower jaw | - |
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| halfheartedness | (noun) the characteristic of being half-hearted; not sincere; lacking full energy, effort, commitment, or resolve. | - |
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| halfpenny | (noun) an English coin worth half a penny | Synonyms: ha'penny |
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| halfpennyworth | (noun) the amount that can be bought for a halfpenny | Synonyms: ha'p'orth |
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| halftime | (noun) an intermission between the first and second half of a game | - |
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| halftone | (noun) an engraving used to reproduce an illustration | Synonyms: halftone engraving, photoengraving |
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| (noun) a print obtained from photoengraving | - |