| headmastership | (noun) the position of headmaster | - |
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| headsman | (noun) an executioner who beheads the condemned person | Synonyms: headman |
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| hebdomad | (noun) any period of seven consecutive days | Synonyms: week |
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| hebdomadal | (adjective) of or occurring every seven days | Synonyms: hebdomadary, weekly |
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| hebdomadally | (adverb) without missing a week | Synonyms: each week, every week, weekly |
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| hebdomadary | (adjective) of or occurring every seven days | Synonyms: hebdomadal, weekly |
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| helmsman | (noun) the person who steers a ship | Synonyms: steerer, steersman |
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| helpmate | (noun) a helpful partner | Synonyms: helpmeet |
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| hemagglutinate | (verb) cause the clumping together (of red blood cells) | Synonyms: haemagglutinate |
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| hemagglutination | (noun) agglutination of red blood cells | Synonyms: haemagglutination |
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| hemal | (adjective) relating to the blood vessels or blood | Synonyms: haemal, haematal, hematal |
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| hemangioma | (noun) benign angioma consisting of a mass of blood vessels; some appear as birthmarks | Synonyms: haemangioma |
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| hematal | (adjective) relating to the blood vessels or blood | Synonyms: haemal, haematal, hemal |
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| hematemesis | (noun) vomiting blood | Synonyms: haematemesis |
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| hematic | (adjective) relating to or containing or affecting blood | Synonyms: haematic, haemic, hemic |
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| hematin | (noun) a complex red organic pigment containing iron and other atoms to which oxygen binds | Synonyms: haem, haemitin, heme, protoheme |
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| hematinic | (noun) a medicine that increases the hemoglobin content of the blood; used to treat iron-deficiency anemia | Synonyms: haematinic |
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| hematite | (noun) the principal form of iron ore; consists of ferric oxide in crystalline form; occurs in a red earthy form | Synonyms: haematite |
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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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| hematogenesis | (noun) the formation of blood cells in the living body (especially in the bone marrow) | Synonyms: haematogenesis, haematopoiesis, haemogenesis, haemopoiesis, hematopoiesis, hemogenesis, hemopoiesis, sanguification |
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| hematogenic | (adjective) pertaining to the formation of blood or blood cells | Synonyms: haematogenic, haematopoietic, haemopoietic, hematopoietic, hemopoietic |
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| hematohiston | (noun) a colorless protein obtained by removing heme from hemoglobin; the oxygen carrying compound in red blood cells | Synonyms: globin, haematohiston |
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| hematoidin | (noun) an orange-yellow pigment in the bile that forms as a product of hemoglobin; excess amounts in the blood produce the yellow appearance observed in jaundice | Synonyms: bilirubin, haematoidin |
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| hematologic | (adjective) of or relating to or involved in hematology | Synonyms: haematological, hematological |
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| hematological | (adjective) of or relating to or involved in hematology | Synonyms: haematological, hematologic |
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| hematologist | (noun) a doctor who specializes in diseases of the blood and blood-forming organs | Synonyms: haematologist |
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| hematology | (noun) the branch of medicine that deals with diseases of the blood and blood-forming organs | Synonyms: haematology |
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| hematolysis | (noun) lysis of erythrocytes with the release of hemoglobin | Synonyms: haematolysis, haemolysis, hemolysis |
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| hematoma | (noun) a localized swelling filled with blood | Synonyms: haematoma |
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| hematopoiesis | (noun) the formation of blood cells in the living body (especially in the bone marrow) | Synonyms: haematogenesis, haematopoiesis, haemogenesis, haemopoiesis, hematogenesis, hemogenesis, hemopoiesis, sanguification |
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| hematopoietic | (adjective) pertaining to the formation of blood or blood cells | Synonyms: haematogenic, haematopoietic, haemopoietic, hematogenic, hemopoietic |
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| hematuria | (noun) the presence of blood in the urine; often a symptom of urinary tract disease | Synonyms: haematuria |
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| 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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| henchman | (noun) someone who assists in a plot | Synonyms: collaborator, confederate, partner in crime |
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| hepatocarcinoma | (noun) carcinoma of the liver | Synonyms: hepatocellular carcinoma, hepatoma, malignant hepatoma |
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| hepatoma | (noun) carcinoma of the liver | Synonyms: hepatocarcinoma, hepatocellular carcinoma, malignant hepatoma |
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| herdsman | (noun) someone who drives a herd | Synonyms: drover, herder |
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| hermaphrodism | (noun) congenital condition in which external genitalia and internal sex organs have both male and female characteristics | Synonyms: hermaphroditism |
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| hermaphrodite | (adjective) of animal or plant; having both male female reproductive organs | Synonyms: hermaphroditic |
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| (noun) one having both male and female sexual characteristics and organs; at birth an unambiguous assignment of male or female cannot be made | Synonyms: androgyne, epicene, epicene person, gynandromorph, intersex |
| hermaphroditic | (adjective) of animal or plant; having both male female reproductive organs | Synonyms: hermaphrodite |
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| (adjective) of or relating to monoclinous plants | - |
| hermaphroditism | (noun) showing characteristics of both sexes | Synonyms: androgyny, bisexuality |
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| (noun) congenital condition in which external genitalia and internal sex organs have both male and female characteristics | Synonyms: hermaphrodism |
| hexadecimal | (adjective) of or pertaining to a number system having 16 as its base | Synonyms: hex |
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| hiemal | (adjective) characteristic of or relating to winter | Synonyms: brumal, hibernal |
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| highwayman | (noun) a holdup man who stops a vehicle and steals from it | Synonyms: highjacker, hijacker, road agent |
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| hitman | (noun) a professional killer who uses a gun | Synonyms: gun, gun for hire, gunman, gunslinger, hired gun, hit man, shooter, torpedo, triggerman |
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| hodman | (noun) a laborer who carries supplies to masons or bricklayers | Synonyms: hod carrier |
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| holidaymaker | (noun) someone who travels for pleasure | Synonyms: tourer, tourist |
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| homage | (noun) respectful deference | Synonyms: court |
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| homemade | (adjective) made or produced in the home or by yourself | - |
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| homemaker | (noun) a wife who manages a household while her husband earns the family income | Synonyms: housewife, lady of the house, woman of the house |
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| homemaking | (noun) the management of a household | - |
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| homochromatic | (adjective) (of light or other electromagnetic radiation) having only one wavelength | Synonyms: monochromatic |
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| hooman | (noun) human, mispronounced for comic effect | - |
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| horseman | (noun) a person who breeds and cares for horses | Synonyms: horse fancier |
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| (noun) a man skilled in equitation | - |
| horsemanship | (noun) skill in handling and riding horses | - |
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| horsewoman | (noun) a woman horseman | - |
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| hotelman | (noun) an owner or manager of hotels | Synonyms: hosteller, hotel manager, hotelier, hotelkeeper |
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| housemaid | (noun) a female domestic | Synonyms: amah, maid, maidservant |
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| houseman | (noun) an advanced student or graduate in medicine gaining supervised practical experience | Synonyms: intern, interne, medical intern |
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| housemaster | (noun) teacher in charge of a school boardinghouse | - |
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| housemate | (noun) someone who resides in the same house with you | - |
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| huamachil | (noun) common thorny tropical American tree having terminal racemes of yellow flowers followed by sickle-shaped or circinate edible pods and yielding good timber and a yellow dye and mucilaginous gum | Synonyms: camachile, manila tamarind, Pithecellobium dulce, wild tamarind |
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| human | (adjective) having human form or attributes as opposed to those of animals or divine beings | - |
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| (adjective) characteristic of humanity | - |
| (adjective) relating to a person | - |
| (noun) any living or extinct member of the family Hominidae characterized by superior intelligence, articulate speech, and erect carriage | Synonyms: homo, human being, man |
| humane | (adjective) marked or motivated by concern with the alleviation of suffering | - |
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| (adjective) pertaining to or concerned with the humanities | Synonyms: humanist, humanistic |
| (adjective) showing evidence of moral and intellectual advancement | - |
| humanely | (adverb) in a humane manner | - |
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| humaneness | (noun) the quality of compassion or consideration for others (people or animals) | - |
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| humanisation | (noun) the act of making more human | Synonyms: humanization |
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| humanise | (verb) make more humane | Synonyms: humanize |
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| humanism | (noun) the doctrine emphasizing a person's capacity for self-realization through reason; rejects religion and the supernatural | Synonyms: secular humanism |
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| (noun) the doctrine that people's duty is to promote human welfare | Synonyms: humanitarianism |
| (noun) the cultural movement of the Renaissance; based on classical studies | - |
| humanist | (adjective) pertaining to or concerned with the humanities | Synonyms: humane, humanistic |
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| (adjective) of or pertaining to a philosophy asserting human dignity and man's capacity for fulfillment through reason and scientific method and often rejecting religion | Synonyms: humanistic |
| (adjective) of or pertaining to Renaissance humanism | Synonyms: humanistic |
| (adjective) marked by humanistic values and devotion to human welfare | Synonyms: human-centered, human-centred, humanistic, humanitarian |
| (noun) a classical scholar or student of the liberal arts | - |
| (noun) an advocate of the principles of humanism; someone concerned with the interests and welfare of humans | Synonyms: humanitarian |
| humanistic | (adjective) pertaining to or concerned with the humanities | Synonyms: humane, humanist |
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| (adjective) of or pertaining to a philosophy asserting human dignity and man's capacity for fulfillment through reason and scientific method and often rejecting religion | Synonyms: humanist |
| (adjective) of or pertaining to Renaissance humanism | Synonyms: humanist |
| (adjective) marked by humanistic values and devotion to human welfare | Synonyms: human-centered, human-centred, humanist, humanitarian |
| humanitarian | (adjective) of or relating to or characteristic of humanitarianism | - |
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| (adjective) marked by humanistic values and devotion to human welfare | Synonyms: human-centered, human-centred, humanist, humanistic |
| (noun) someone devoted to the promotion of human welfare and to social reforms | Synonyms: do-gooder, improver |
| (noun) an advocate of the principles of humanism; someone concerned with the interests and welfare of humans | Synonyms: humanist |
| humanitarianism | (noun) the doctrine that people's duty is to promote human welfare | Synonyms: humanism |
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| humanities | (noun) studies intended to provide general knowledge and intellectual skills (rather than occupational or professional skills) | Synonyms: arts, humanistic discipline, liberal arts |
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| humanity | (noun) all of the living human inhabitants of the earth | Synonyms: human beings, human race, humankind, humans, man, mankind, world |
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| (noun) the quality of being humane | - |
| (noun) the quality of being human | Synonyms: humanness, manhood |
| humanization | (noun) the act of making more human | Synonyms: humanisation |
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| humanize | (verb) make more humane | Synonyms: humanise |
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| humankind | (noun) all of the living human inhabitants of the earth | Synonyms: human beings, human race, humanity, humans, man, mankind, world |
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| humanlike | (adjective) suggesting human characteristics for animals or inanimate things | Synonyms: anthropomorphic, anthropomorphous |
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| humanly | (adverb) in the manner of human beings | - |
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| humanness | (noun) the quality of being human | Synonyms: humanity, manhood |
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| humanoid | (noun) an automaton that resembles a human being | Synonyms: android, mechanical man |
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| humans | (noun) all of the living human inhabitants of the earth | Synonyms: human beings, human race, humanity, humankind, man, mankind, world |
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| humate | (noun) material that is high in humic acids | - |
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| huntsman | (noun) someone who hunts game | Synonyms: hunter |
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| husbandman | (noun) a person who operates a farm | Synonyms: farmer, granger, sodbuster |
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| hybridoma | (noun) a hybrid cell resulting from the fusion of a lymphocyte and a tumor cell; used to culture a specific monoclonal antibody | - |
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| hydromancer | (noun) one who practices hydromancy | - |
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| hydromancy | (noun) divination by water (as by patterns seen in the ebb and flow of the tides) | - |
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| hypermarket | (noun) a huge supermarket (usually built on the outskirts of a town) | - |
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| hypermastigote | (noun) flagellate symbiotic in the intestines of e.g. termites | - |
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