| 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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| 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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| 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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| hematuria | (noun) the presence of blood in the urine; often a symptom of urinary tract disease | Synonyms: haematuria |
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| heme | (noun) a complex red organic pigment containing iron and other atoms to which oxygen binds | Synonyms: haem, haemitin, hematin, protoheme |
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| hemeralopia | (noun) inability to see clearly in bright light | Synonyms: day blindness |
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| hemerobiid | (noun) small dark-colored lacewing fly | Synonyms: brown lacewing, hemerobiid fly |
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| hemiacetal | (noun) an organic compound usually formed as an intermediate product in the preparation of acetals from aldehydes or ketones | - |
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| hemianopia | (noun) blindness in one half of the visual field of one or both eyes | Synonyms: hemianopsia |
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| hemianopsia | (noun) blindness in one half of the visual field of one or both eyes | Synonyms: hemianopia |
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| hemicrania | (noun) a severe recurring vascular headache; occurs more frequently in women than men | Synonyms: megrim, migraine, sick headache |
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| hemicycle | (noun) a plane figure with the shape of half a circle | Synonyms: semicircle |
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| hemidemisemiquaver | (noun) a musical note having the time value of a sixty-fourth of a whole note | Synonyms: sixty-fourth note |
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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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| hemiepiphyte | (noun) a plant that is an epiphyte for part of its life | Synonyms: semiepiphyte |
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| hemimetabolism | (noun) incomplete or partial metamorphosis in insects | Synonyms: hemimetaboly, hemimetamorphosis |
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| hemimetaboly | (noun) incomplete or partial metamorphosis in insects | Synonyms: hemimetabolism, hemimetamorphosis |
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| hemimetamorphosis | (noun) incomplete or partial metamorphosis in insects | Synonyms: hemimetabolism, hemimetaboly |
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| hemimorphite | (noun) a white mineral; a common ore of zinc | Synonyms: calamine |
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| hemin | (noun) a reddish-brown chloride of heme; produced from hemoglobin in laboratory tests for the presence of blood | Synonyms: protohemin |
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| hemiparasite | (noun) a parasitic plant that contains some chlorophyll and therefore is capable of photosynthesis | Synonyms: semiparasite |
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| hemiplegia | (noun) paralysis of one side of the body | Synonyms: unilateral paralysis |
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| hemiplegic | (noun) a person who has hemiplegia (is paralyzed on one side of the body) | - |
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| hemipode | (noun) small quail-like terrestrial bird of southern Eurasia and northern Africa that lacks a hind toe; classified with wading birds but inhabits grassy plains | Synonyms: bustard quail, button-quail, button quail |
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| hemipteran | (noun) insects with sucking mouthparts and forewings thickened and leathery at the base; usually show incomplete metamorphosis | Synonyms: bug, hemipteron, hemipterous insect |
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| hemipteron | (noun) insects with sucking mouthparts and forewings thickened and leathery at the base; usually show incomplete metamorphosis | Synonyms: bug, hemipteran, hemipterous insect |
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| hemisphere | (noun) either half of the cerebrum | Synonyms: cerebral hemisphere |
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| (noun) half of the terrestrial globe | - |
| (noun) half of a sphere | - |
| hemline | (noun) the line formed by the lower edge of a skirt or coat | - |
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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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| hemodialysis | (noun) dialysis of the blood to remove toxic substances or metabolic wastes from the bloodstream; used in the case of kidney failure | Synonyms: haemodialysis |
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| hemodialyzer | (noun) a machine that uses dialysis to remove impurities and waste products from the bloodstream before returning the blood to the patient's body | Synonyms: artificial kidney |
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| hemodynamics | (noun) the branch of physiology that studies the circulation of the blood and the forces involved | - |
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| hemogenesis | (noun) the formation of blood cells in the living body (especially in the bone marrow) | Synonyms: haematogenesis, haematopoiesis, haemogenesis, haemopoiesis, hematogenesis, hematopoiesis, hemopoiesis, sanguification |
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| hemoglobin | (noun) a hemoprotein composed of globin and heme that gives red blood cells their characteristic color; function primarily to transport oxygen from the lungs to the body tissues | Synonyms: haemoglobin, Hb |
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| hemoglobinemia | (noun) presence of excessive hemoglobin in the blood plasma | Synonyms: haemoglobinemia |
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| hemoglobinopathy | (noun) a blood disease characterized by the presence of abnormal hemoglobins in the blood | Synonyms: haemoglobinopathy |
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| hemoglobinuria | (noun) presence of hemoglobin in the urine | Synonyms: haemoglobinuria |
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| hemolysin | (noun) any substance that can cause lysis (destruction) of erythrocytes (red blood cells) and the release of their hemoglobin | Synonyms: erythrocytolysin, erythrolysin, haemolysin |
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| hemolysis | (noun) lysis of erythrocytes with the release of hemoglobin | Synonyms: haematolysis, haemolysis, hematolysis |
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| hemophile | (noun) someone who has hemophilia and is subject to uncontrollable bleeding | Synonyms: bleeder, haemophile, haemophiliac, hemophiliac |
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| hemophilia | (noun) congenital tendency to uncontrolled bleeding; usually affects males and is transmitted from mother to son | Synonyms: bleeder's disease, haemophilia |
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| hemophiliac | (noun) someone who has hemophilia and is subject to uncontrollable bleeding | Synonyms: bleeder, haemophile, haemophiliac, hemophile |
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| hemopoiesis | (noun) the formation of blood cells in the living body (especially in the bone marrow) | Synonyms: haematogenesis, haematopoiesis, haemogenesis, haemopoiesis, hematogenesis, hematopoiesis, hemogenesis, sanguification |
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| hemoprotein | (noun) a conjugated protein linked to a compound of iron and porphyrin | Synonyms: haemoprotein |
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| hemoptysis | (noun) coughing up blood from the respiratory tract; usually indicates a severe infection of the bronchi or lungs | Synonyms: haemoptysis |
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| hemorrhage | (noun) the flow of blood from a ruptured blood vessel | Synonyms: bleeding, haemorrhage |
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| hemorrhoid | (noun) venous swelling external or internal to the anal sphincter | Synonyms: haemorrhoid, piles |
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| hemorrhoidectomy | (noun) surgical procedure for tying hemorrhoids and excising them | Synonyms: haemorrhoidectomy |
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| hemosiderin | (noun) a granular brown substance composed of ferric oxide; left from the breakdown of hemoglobin; can be a sign of disturbed iron metabolism | Synonyms: haemosiderin |
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| hemosiderosis | (noun) abnormal deposit of hemosiderin; often a symptom of thalassemia or hemochromatosis | Synonyms: haemosiderosis |
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| hemostasia | (noun) surgical procedure of stopping the flow of blood (as with a hemostat) | Synonyms: haemostasia, haemostasis, hemostasis |
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| hemostasis | (noun) surgical procedure of stopping the flow of blood (as with a hemostat) | Synonyms: haemostasia, haemostasis, hemostasia |
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| hemostat | (noun) a surgical instrument that stops bleeding by clamping the blood vessel | Synonyms: haemostat |
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| hemothorax | (noun) accumulation of blood in the pleural cavity (the space between the lungs and the walls of the chest) | Synonyms: haemothorax |
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| hemp | (noun) a rope that is used by a hangman to execute persons who have been condemned to death by hanging | Synonyms: halter, hangman's halter, hangman's rope, hempen necktie |
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| (noun) any plant of the genus Cannabis; a coarse bushy annual with palmate leaves and clusters of small green flowers; yields tough fibers and narcotic drugs | Synonyms: cannabis |
| (noun) a plant fiber | - |
| hemstitch | (noun) embroidery similar to drawnwork | - |
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| (noun) a stitch in which parallel threads are drawn and exposed threads are caught together in groups | Synonyms: hemstitching |
| hemstitching | (noun) a stitch in which parallel threads are drawn and exposed threads are caught together in groups | Synonyms: hemstitch |
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| hen | (noun) adult female chicken | Synonyms: biddy |
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| (noun) adult female bird | - |
| (noun) female of certain aquatic animals e.g. octopus or lobster | - |
| (noun) flesh of an older chicken suitable for stewing | - |
| henbane | (noun) poisonous fetid Old World herb having sticky hairy leaves and yellow-brown flowers; yields hyoscyamine and scopolamine | Synonyms: black henbane, Hyoscyamus niger, stinking nightshade |
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| henbit | (noun) Eurasian plant having toothed leaves and small two-lipped white or purplish-red flowers | Synonyms: Lamium amplexicaule |
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| henchman | (noun) someone who assists in a plot | Synonyms: collaborator, confederate, partner in crime |
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| hencoop | (noun) a farm building for housing poultry | Synonyms: chicken coop, coop, henhouse |
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| hendiadys | (noun) use of two conjoined nouns instead of a noun and modifier | - |
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| henhouse | (noun) a farm building for housing poultry | Synonyms: chicken coop, coop, hencoop |
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| henna | (noun) a reddish brown dye used especially on hair | - |
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| henroost | (noun) a roost for hens at night | - |
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| henry | (noun) a unit of inductance in which an induced electromotive force of one volt is produced when the current is varied at the rate of one ampere per second | Synonyms: H |
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| hepadnavirus | (noun) a group of animal DNA viruses including viruses of ducks and woodchucks and squirrels and others as well as the virus causing hepatitis B in humans | - |
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| heparin | (noun) a polysaccharide produced in basophils (especially in the lung and liver) and that inhibits the activity of thrombin in coagulation of the blood; it (trade names Lipo-Hepin and Liquaemin) is used as an anticoagulant in the treatment of thrombosis and in heart surgery | Synonyms: Lipo-Hepin, Liquaemin |
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| hepatic | (noun) any of numerous small green nonvascular plants of the class Hepaticopsida growing in wet places and resembling green seaweeds or leafy mosses | Synonyms: liverwort |
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| hepatica | (noun) any of several plants of the genus Hepatica having three-lobed leaves and white or pinkish flowers in early spring; of moist and mossy subalpine woodland areas of north temperate regions | Synonyms: liverleaf |
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| (noun) a common liverwort | Synonyms: Marchantia polymorpha |
| hepatitis | (noun) inflammation of the liver caused by a virus or a toxin | - |
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| hepatocarcinoma | (noun) carcinoma of the liver | Synonyms: hepatocellular carcinoma, hepatoma, malignant hepatoma |
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| hepatoflavin | (noun) a B vitamin that prevents skin lesions and weight loss | Synonyms: lactoflavin, ovoflavin, riboflavin, vitamin B2, vitamin G |
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| hepatoma | (noun) carcinoma of the liver | Synonyms: hepatocarcinoma, hepatocellular carcinoma, malignant hepatoma |
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| hepatomegaly | (noun) abnormal enlargement of the liver | Synonyms: megalohepatia |
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| hepatotoxin | (noun) any toxin that affects the liver | - |
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| heptad | (noun) the cardinal number that is the sum of six and one | Synonyms: 7, septenary, septet, seven, sevener, VII |
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| heptagon | (noun) a seven-sided polygon | - |
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| heptane | (noun) a colorless volatile highly flammable liquid obtained from petroleum and used as an anesthetic or a solvent or in determining octane ratings | - |
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| heptasyllable | (noun) a word or line of verse of seven syllables. | - |
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| heptose | (noun) a monosaccharide with seven carbon atoms. | - |
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| herald | (noun) something that precedes and indicates the approach of something or someone | Synonyms: forerunner, harbinger, precursor, predecessor |
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| (noun) (formal) a person who announces important news | Synonyms: trumpeter |
| heraldry | (noun) emblem indicating the right of a person to bear arms | - |
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| (noun) the study and classification of armorial bearings and the tracing of genealogies | - |