| 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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| acanthocyte | (noun) an abnormal red blood cell that has thorny projections of protoplasm | - |
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| acanthocytosis | (noun) the presence of acanthocytes in the blood stream (as in abetalipoproteinemia) | - |
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| adhocracy | (noun) an organization with little or no structure | - |
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| aftershock | (noun) a tremor (or one of a series of tremors) occurring after the main shock of an earthquake | - |
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| choc | (noun) colloquial British abbreviation | - |
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| chock | (noun) a block of wood used to prevent the sliding or rolling of a heavy object | Synonyms: wedge |
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| chocolate | (noun) a medium brown to dark-brown color | Synonyms: burnt umber, coffee, deep brown, umber |
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| (noun) a food made from roasted ground cacao beans | - |
| (noun) a beverage made from cocoa powder and milk and sugar; usually drunk hot | Synonyms: cocoa, drinking chocolate, hot chocolate |
| 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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| echocardiogram | (noun) a graphical image of the heart produced by an echocardiograph | - |
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| echocardiograph | (noun) a sonograph that creates an image of the heart and its abnormalities | - |
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| echocardiography | (noun) a noninvasive diagnostic procedure that uses ultrasound to study to structure and motions of the heart | - |
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| electroshock | (noun) the administration of a strong electric current that passes through the brain to induce convulsions and coma | Synonyms: ECT, electroconvulsive therapy, electroshock therapy |
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| foreshock | (noun) a tremor preceding an earthquake | - |
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| hock | (noun) tarsal joint of the hind leg of hoofed mammals; corresponds to the human ankle | Synonyms: hock-joint |
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| (noun) any of several white wines from the Rhine River valley in Germany (`hock' is British usage) | Synonyms: Rhenish, Rhine wine |
| hockey | (noun) a game resembling ice hockey that is played on an open field; two opposing teams use curved hockey sticks try to drive a ball into the opponents' net | Synonyms: field hockey |
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| (noun) a game played on an ice rink by two opposing teams of six skaters each who try to knock a flat round puck into the opponents' goal with angled hockey sticks | Synonyms: hockey game, ice hockey |
| hollyhock | (noun) any of various tall plants of the genus Alcea; native to the Middle East but widely naturalized and cultivated for its very large variously colored flowers | - |
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| (noun) any of various plants of the genus Althaea; similar to but having smaller flowers than genus Alcea | Synonyms: althaea, althea |
| lymphocyte | (noun) an agranulocytic leukocyte that normally makes up a quarter of the white blood cell count but increases in the presence of infection | Synonyms: lymph cell |
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| lymphocytopenia | (noun) an abnormally small number of lymphocytes in the circulating blood | Synonyms: lymphopenia |
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| lymphocytosis | (noun) an abnormal increase in the number of lymphocytes in the circulating blood | - |
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| methocarbamol | (noun) muscle relaxant for skeletal muscles (trade name Robaxin) used to treat spasms | Synonyms: Robaxin |
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| onchocerciasis | (noun) infestation with slender threadlike roundworms (filaria) deposited under the skin by the bite of black fleas; when the eyes are involved it can result in blindness; common in Africa and tropical America | Synonyms: river blindness |
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| orthochorea | (noun) a form of chorea in which spasms occur mainly when the patient is erect | - |
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| orthoclase | (noun) a white or colored monoclinic feldspar | - |
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| phocomelia | (noun) an abnormality of development in which the upper part of an arm or leg is missing so the hands or feet are attached to the body like stumps; rare condition that results from taking thalidomide during pregnancy | Synonyms: seal limbs |
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| phosphocreatine | (noun) an organic compound of creatine and phosphoric acid; found in the muscles of vertebrates where its hydrolysis releases energy for muscular contraction | Synonyms: creatine phosphate, creatine phosphoric acid |
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| scaphocephaly | (noun) congenital malformation of the skull which is long and narrow; frequently accompanied by mental retardation | - |
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| shock | (noun) a reflex response to the passage of electric current through the body | Synonyms: electric shock, electrical shock |
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| (noun) the violent interaction of individuals or groups entering into combat | Synonyms: impact |
| (noun) a mechanical damper; absorbs energy of sudden impulses | Synonyms: cushion, shock absorber |
| (noun) an instance of agitation of the earth's crust | Synonyms: seismic disturbance |
| (noun) an unpleasant or disappointing surprise | Synonyms: blow |
| (noun) a sudden jarring impact | Synonyms: jar, jolt, jounce |
| (noun) the feeling of distress and disbelief that you have when something bad happens accidentally | Synonyms: daze, stupor |
| (noun) a pile of sheaves of grain set on end in a field to dry; stalks of Indian corn set up in a field | - |
| (noun) a bushy thick mass (especially hair) | - |
| (noun) (pathology) bodily collapse or near collapse caused by inadequate oxygen delivery to the cells; characterized by reduced cardiac output and rapid heartbeat and circulatory insufficiency and pallor | - |
| shocker | (noun) a sensational message (in a film or play or novel) | - |
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| (noun) a shockingly bad person | - |