| haematocytopenia | (noun) an abnormally low number of red blood cells in the blood | Synonyms: hematocytopenia |
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| haematocyturia | (noun) the presence of red blood cells in the urine | Synonyms: hematocyturia |
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| halocarbon | (noun) one of various compounds of carbon and any of the halogens | - |
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| hammerlock | (noun) a wrestling hold in which the opponent's arm is twisted up behind his back | - |
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| hammock | (noun) a hanging bed of canvas or rope netting (usually suspended between two trees); swings easily | Synonyms: sack |
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| (noun) a small natural hill | Synonyms: hillock, hummock, knoll, mound |
| handlock | (noun) shackle that consists of a metal loop that can be locked around the wrist; usually used in pairs | Synonyms: cuff, handcuff, manacle |
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| hassock | (noun) a cushion for kneeling on (as when praying in church) | - |
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| (noun) thick cushion used as a seat | Synonyms: ottoman, pouf, pouffe, puff |
| havelock | (noun) a cloth covering for a service cap with a flap extending over the back of the neck to protect the neck from direct rays of the sun | - |
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| havoc | (noun) violent and needless disturbance | Synonyms: mayhem |
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| haycock | (noun) a small cone-shaped pile of hay that has been left in the field until it is dry enough to carry to the hayrick | - |
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| headlock | (noun) a wrestling hold in which the opponent's head is locked between the crook of your elbow and the side of your body | - |
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| headstock | (noun) the stationary support in a machine or power tool that supports and drives a revolving part (as a chuck or the spindle on a lathe) | - |
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| hematocele | (noun) swelling caused by blood collecting in a body cavity (especially a swelling of the membrane covering the testis) | Synonyms: haematocele, haematocoele, hematocoele |
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| hematochezia | (noun) passage of stools containing blood (as from diverticulosis or colon cancer or peptic ulcer) | Synonyms: haematochezia |
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| hematochrome | (noun) a reddish coloring material found in some algae | - |
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| hematocoele | (noun) swelling caused by blood collecting in a body cavity (especially a swelling of the membrane covering the testis) | Synonyms: haematocele, haematocoele, hematocele |
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| hematocolpometra | (noun) accumulation of blood in the vagina and uterus | Synonyms: haematocolpometra |
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| hematocolpos | (noun) accumulation of menstrual blood in the vagina (usually due to an imperforate hymen) | Synonyms: haematocolpos |
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| hematocrit | (noun) a measuring instrument to determine (usually by centrifugation) the relative amounts of corpuscles and plasma in the blood | Synonyms: haematocrit |
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| (noun) the ratio of the volume occupied by packed red blood cells to the volume of the whole blood as measured by a hematocrit | Synonyms: haematocrit, packed cell volume |
| hematocyst | (noun) a cyst containing blood | Synonyms: blood cyst, hemorrhagic cyst |
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| hematocytopenia | (noun) an abnormally low number of red blood cells in the blood | Synonyms: haematocytopenia |
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| hematocyturia | (noun) the presence of red blood cells in the urine | Synonyms: haematocyturia |
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| hemlock | (noun) an evergreen tree, could refer to any one of a genus of conifers named Tsuga | Synonyms: hemlock tree |
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| (noun) soft coarse splintery wood of a hemlock tree especially the western hemlock | - |
| (noun) large branching biennial herb native to Eurasia and Africa and adventive in North America having large fernlike leaves and white flowers; usually found in damp habitats; all parts extremely poisonous | Synonyms: California fern, Conium maculatum, Nebraska fern, poison hemlock, poison parsley, winter fern |
| (noun) poisonous drug derived from an Eurasian plant of the genus Conium | - |
| hemochromatosis | (noun) pathology in which iron accumulates in the tissues; characterized by bronzed skin and enlarged liver and diabetes mellitus and abnormalities of the pancreas and the joints | Synonyms: bronzed diabetes, iron-storage disease, iron overload |
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| hepatocarcinoma | (noun) carcinoma of the liver | Synonyms: hepatocellular carcinoma, hepatoma, malignant hepatoma |
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| heterocycle | (noun) a ring of atoms of more than one kind; especially a ring of carbon atoms containing at least one atom that is not carbon | Synonyms: heterocyclic ring |
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| (noun) a compound containing a heterocyclic ring | Synonyms: heterocyclic, heterocyclic compound |
| heterocyclic | (noun) a compound containing a heterocyclic ring | Synonyms: heterocycle, heterocyclic compound |
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| hierocracy | (noun) a ruling body composed of clergy | - |
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| hillock | (noun) a small natural hill | Synonyms: hammock, hummock, knoll, mound |
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| hippocampus | (noun) a complex neural structure (shaped like a sea horse) consisting of grey matter and located on the floor of each lateral ventricle; intimately involved in motivation and emotion as part of the limbic system; has a central role in the formation of memories | - |
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| histiocyte | (noun) a macrophage that is found in connective tissue | - |
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| histiocytosis | (noun) a blood disease characterized by an abnormal multiplication of macrophages | - |
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| histocompatibility | (noun) condition in which the cells of one tissue can survive in the presence of cells of another tissue | - |
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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 |
| holocaust | (noun) an act of mass destruction and loss of life (especially in war or by fire) | - |
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| holocephalan | (noun) fish with high compressed head and a body tapering off into a long tail | Synonyms: holocephalian |
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| holocephalian | (noun) fish with high compressed head and a body tapering off into a long tail | Synonyms: holocephalan |
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| hooch | (noun) an illicitly distilled (and usually inferior) alcoholic liquor | Synonyms: hootch |
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| hummock | (noun) a small natural hill | Synonyms: hammock, hillock, knoll, mound |
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| hydrocarbon | (noun) an organic compound containing only carbon and hydrogen | - |
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| hydrocele | (noun) disorder in which serous fluid accumulates in a body sac (especially in the scrotum) | - |
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| hydrocephalus | (noun) an abnormal condition in which cerebrospinal fluid collects in the ventricles of the brain; in infants it can cause abnormally rapid growth of the head and bulging fontanelles and a small face; in adults the symptoms are primarily neurological | Synonyms: hydrocephaly |
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| hydrocephaly | (noun) an abnormal condition in which cerebrospinal fluid collects in the ventricles of the brain; in infants it can cause abnormally rapid growth of the head and bulging fontanelles and a small face; in adults the symptoms are primarily neurological | Synonyms: hydrocephalus |
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| hydrochloride | (noun) a complex consisting of an organic base in association with hydrogen chloride | - |
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| hydrochlorofluorocarbon | (noun) a fluorocarbon that is replacing chlorofluorocarbon as a refrigerant and propellant in aerosol cans; considered to be somewhat less destructive to the atmosphere | Synonyms: HCFC |
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| hydrochlorothiazide | (noun) a diuretic drug (trade name Microzide, Esidrix, and HydroDIURIL) used in the treatment of hypertension | Synonyms: Esidrix, HydroDIURIL, Microzide |
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| hydrocolloid | (noun) a substance that forms a gel with water | - |
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| hydrocortisone | (noun) an adrenal-cortex hormone (trade names Hydrocortone or Cortef) that is active in carbohydrate and protein metabolism | Synonyms: Cortef, cortisol, Hydrocortone |
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| hydrocracking | (noun) the process whereby hydrocarbon molecules of petroleum are broken down into kerosene and gasolene by the addition of hydrogen under high pressure in the presence of a catalyst | - |
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| hydrofluorocarbon | (noun) a fluorocarbon emitted as a by-product of industrial manufacturing | Synonyms: HFC |
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| hyperadrenocorticism | (noun) a glandular disorder caused by excessive cortisol | Synonyms: Cushing's syndrome |
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| hypervelocity | (noun) excessive velocity | - |
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| hypoadrenocorticism | (noun) a glandular disorder caused by failure of function of the cortex of the adrenal gland and marked by anemia and prostration with brownish skin | Synonyms: Addison's disease, Addison's syndrome, hypoadrenalism |
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| hypocalcaemia | (noun) abnormally low level of calcium in the blood; associated with hypoparathyroidism or kidney malfunction or vitamin D deficiency | Synonyms: hypocalcemia |
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| hypocalcemia | (noun) abnormally low level of calcium in the blood; associated with hypoparathyroidism or kidney malfunction or vitamin D deficiency | Synonyms: hypocalcaemia |
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| hypocapnia | (noun) a state in which the level of carbon dioxide in the blood is lower than normal; can result from deep or rapid breathing | Synonyms: acapnia |
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| hypocellularity | (noun) the state of having abnormally few cells | - |
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| hypochlorite | (noun) any salt or ester of hypochlorous acid | - |
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| hypochondria | (noun) chronic and abnormal anxiety about imaginary symptoms and ailments | Synonyms: hypochondriasis |
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| hypochondriac | (noun) a patient with imaginary symptoms and ailments | - |
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| hypochondriasis | (noun) chronic and abnormal anxiety about imaginary symptoms and ailments | Synonyms: hypochondria |
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| hypochondrium | (noun) the upper region of the abdomen just below the lowest ribs on either side of the epigastrium | - |
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| hypocorism | (noun) a name of endearment (especially one using a diminutive suffix) | Synonyms: pet name |
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| hypocrisy | (noun) insincerity by virtue of pretending to have qualities or beliefs that you do not really have | - |
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| (noun) an expression of agreement that is not supported by real conviction | Synonyms: lip service |
| hypocrite | (noun) a person who professes beliefs and opinions that he or she does not hold in order to conceal his or her real feelings or motives | Synonyms: dissembler, dissimulator, phoney, phony, pretender |
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| hypocycloid | (noun) a line generated by a point on a circle that rolls around inside another circle | - |
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| hysterocatalepsy | (noun) hysteria with cataleptic symptoms | - |
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| iconoclasm | (noun) the orientation of an iconoclast | - |
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| iconoclast | (noun) someone who attacks cherished ideas or traditional institutions | - |
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| (noun) a destroyer of images used in religious worship | Synonyms: image breaker |
| idiocy | (noun) extreme mental retardation | Synonyms: amentia |
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| idocrase | (noun) a green or yellow or brown mineral consisting of a hydrated silicate; it occurs as crystals in limestone and is used a gemstone | Synonyms: vesuvian, vesuvianite |
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| immunochemistry | (noun) the field of chemistry concerned with chemical processes in immunology (such as chemical studies of antigens and antibodies) | Synonyms: chemoimmunology |
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| immunocompetence | (noun) the ability to develop an immune response following exposure to an antigen | - |
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| immunohistochemistry | (noun) an assay that shows specific antigens in tissues by the use of markers that are either fluorescent dyes or enzymes (such as horseradish peroxidase) | - |
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| indoctrination | (noun) teaching someone to accept doctrines uncritically | - |
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| innocence | (noun) the quality of innocent naivete | Synonyms: artlessness, ingenuousness, naturalness |
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| (noun) a state or condition of being innocent of a specific crime or offense | - |
| (noun) the state of being unsullied by sin or moral wrong; lacking a knowledge of evil | Synonyms: pureness, purity, sinlessness, whiteness |
| innocency | (noun) an innocent quality or thing or act | - |
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| innocense | (noun) white and lavender to pale-blue flowers grow in perfect rings of widely spaced bands around the stems forming a kind of pagoda; California | Synonyms: Collinsia bicolor, Collinsia heterophylla, purple chinese houses |
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| innocent | (noun) a person who lacks knowledge of evil | Synonyms: inexperienced person |
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| inoculant | (noun) a substance (a virus or toxin or immune serum) that is introduced into the body to produce or increase immunity to a particular disease | Synonyms: inoculum |
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| inoculating | (noun) the act of protecting against disease by introducing a vaccine into the body to induce immunity | Synonyms: vaccinating |
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| inoculation | (noun) taking a vaccine as a precaution against contracting a disease | Synonyms: vaccination |
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| inoculator | (noun) a medical practitioner who inoculates people against diseases | Synonyms: vaccinator |
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| inoculum | (noun) a substance (a virus or toxin or immune serum) that is introduced into the body to produce or increase immunity to a particular disease | Synonyms: inoculant |
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| interlock | (noun) the act of interlocking or meshing | Synonyms: interlocking, mesh, meshing |
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| (noun) a device that prevents an automotive engine from starting | Synonyms: ignition interlock |
| interlocking | (noun) the act of interlocking or meshing | Synonyms: interlock, mesh, meshing |
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| (noun) contact by fitting together | Synonyms: engagement, mesh, meshing |
| interlocutor | (noun) a person who takes part in a conversation | Synonyms: conversational partner |
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| (noun) the performer in the middle of a minstrel line who engages the others in talk | Synonyms: middleman |
| interoception | (noun) sensitivity to stimuli originating inside of the body | - |
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| interoceptor | (noun) any receptor that responds to stimuli inside the body | Synonyms: enteroceptor |
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| invocation | (noun) the act of appealing for help | - |
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| (noun) calling up a spirit or devil | Synonyms: conjuration, conjuring, conjury |
| (noun) a prayer asking God's help as part of a religious service | Synonyms: supplication |
| (noun) an incantation used in conjuring or summoning a devil | - |
| iodochlorhydroxyquin | (noun) drug used to treat certain fungal infection (as athlete's foot) | Synonyms: Clioquinol |
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| iodocompound | (noun) a compound containing the covalent iodine radical | - |
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| iproclozide | (noun) an antidepressant drug that acts as a monoamine oxidase inhibitor | - |
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| iridocyclitis | (noun) inflammation of the iris and ciliary body of the eye | - |
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| irrevocability | (noun) The state or condition of being impossible to retract or reverse; finality. | - |
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| isocarboxazid | (noun) a monoamine oxidase inhibitor (trade name Marplan) that is used to treat clinical depression | Synonyms: Marplan |
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| isochalaz | (noun) a line indicating a constant frequency of hail storms. | - |
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| isocheim | (noun) a line on a map connecting places with the same mean winter temperature. | - |
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