| haemodialysis | (noun) dialysis of the blood to remove toxic substances or metabolic wastes from the bloodstream; used in the case of kidney failure | Synonyms: hemodialysis |
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| hardihood | (noun) the trait of being willing to undertake things that involve risk or danger | Synonyms: boldness, daring, hardiness |
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| hardwood | (noun) the wood of broad-leaved dicotyledonous trees (as distinguished from the wood of conifers) | - |
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| hazelwood | (noun) reddish-brown wood and lumber from heartwood of the sweet gum tree used to make furniture | Synonyms: red gum, satin walnut, sweet gum |
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| heartwood | (noun) the older inactive central wood of a tree or woody plant; usually darker and denser than the surrounding sapwood | Synonyms: duramen |
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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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| 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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| 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 | (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 |
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| 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 |
| heterodoxy | (noun) the quality of being unorthodox | Synonyms: unorthodoxy |
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| (noun) any opinions or doctrines at variance with the official or orthodox position | Synonyms: heresy, unorthodoxy |
| hexapod | (noun) an animal having six feet | - |
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| hippodrome | (noun) a stadium for horse shows or horse races | - |
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| hod | (noun) an open box attached to a long pole handle; bricks or mortar are carried on the shoulder | - |
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| hodgepodge | (noun) a theory or argument made up of miscellaneous or incongruous ideas | Synonyms: jumble, patchwork |
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| (noun) a motley assortment of things | Synonyms: farrago, gallimaufry, hotchpotch, melange, mingle-mangle, mishmash, oddments, odds and ends, omnium-gatherum, ragbag |
| hodman | (noun) a laborer who carries supplies to masons or bricklayers | Synonyms: hod carrier |
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| hodometer | (noun) a meter that shows mileage traversed | Synonyms: mileometer, milometer, odometer |
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| hodoscope | (noun) (physics) scientific instrument that traces the path of a charged particle | - |
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| homebody | (noun) a person who seldom goes anywhere; one not given to wandering or travel | Synonyms: stay-at-home |
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| hood | (noun) (zoology) an expandable part or marking that resembles a hood on the head or neck of an animal | - |
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| (noun) protective covering consisting of a metal part that covers the engine | Synonyms: bonnet, cowl, cowling |
| (noun) a headdress that protects the head and face | - |
| (noun) the folding roof of a carriage | - |
| (noun) metal covering leading to a vent that exhausts smoke or fumes | Synonyms: exhaust hood |
| (noun) (falconry) a leather covering for a hawk's head | - |
| (noun) a tubular attachment used to keep stray light out of the lens of a camera | Synonyms: lens hood |
| (noun) (slang) a neighborhood or community | Synonyms: 'hood |
| (noun) a protective covering that is part of a plant | Synonyms: cap |
| (noun) an aggressive and violent young criminal | Synonyms: goon, hoodlum, punk, strong-armer, thug, tough, toughie |
| hoodlum | (noun) an aggressive and violent young criminal | Synonyms: goon, hood, punk, strong-armer, thug, tough, toughie |
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| hoodmold | (noun) a protective drip that is made of stone | Synonyms: dripstone, hoodmould |
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| hoodmould | (noun) a protective drip that is made of stone | Synonyms: dripstone, hoodmold |
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| hoodoo | (noun) a charm superstitiously believed to embody magical powers | Synonyms: fetich, fetish, juju, voodoo |
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| (noun) something believed to bring bad luck | - |
| (noun) a practitioner of voodoo | - |
| (noun) (geology) a column of weathered and unusually shaped rock | - |
| hoodooism | (noun) a religious cult practiced chiefly in Caribbean countries (especially Haiti); involves witchcraft and animistic deities | Synonyms: vodoun, voodoo, voodooism |
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| hudood | (noun) Islamic laws stating the limits ordained by Allah and including the deterrent punishments for serious crimes | Synonyms: hudud |
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| hydathode | (noun) a pore that exudes water on the surface or margin of a leaf of higher plants | Synonyms: water pore, water stoma |
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| hydrodynamics | (noun) study of fluids in motion | Synonyms: hydrokinetics |
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| hygrodeik | (noun) a wet and dry bulb hygrometer | - |
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| hymnody | (noun) the act of singing psalms or hymns | Synonyms: psalmody |
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| hypodermic | (noun) a piston syringe that is fitted with a hypodermic needle for giving injections | Synonyms: hypo, hypodermic syringe |
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| hypodermis | (noun) layer of cells that secretes the chitinous cuticle in e.g. arthropods | - |
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| ictodosaur | (noun) intermediate in form between the therapsids and most primitive true mammals | - |
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| iguanodon | (noun) massive herbivorous bipedal dinosaur with a long heavy tail; common in Europe and northern Africa; early Cretaceous period | - |
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| immoderateness | (noun) the quality of being excessive and lacking in moderation | Synonyms: immoderation |
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| immoderation | (noun) the quality of being excessive and lacking in moderation | Synonyms: immoderateness |
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| immodesty | (noun) the perverse act of exposing and attracting attention to your own genitals | Synonyms: exhibitionism |
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| (noun) the trait of being vain and conceited | - |
| immunodeficiency | (noun) immunological disorder in which some part of the body's immune system is inadequate and resistance to infectious diseases is reduced | - |
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| incommodiousness | (noun) an inconvenient discomfort | Synonyms: inconvenience |
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| internode | (noun) a segment of a stem between two nodes | - |
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| introduction | (noun) the act of putting one thing into another | Synonyms: insertion, intromission |
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| (noun) the act of beginning something new | Synonyms: debut, entry, first appearance, launching, unveiling |
| (noun) the act of starting something for the first time; introducing something new | Synonyms: creation, foundation, founding, initiation, innovation, instauration, institution, origination |
| (noun) the first section of a communication | - |
| (noun) formally making a person known to another or to the public | Synonyms: intro, presentation |
| (noun) a basic or elementary instructional text | - |
| (noun) a new proposal | - |
| introductoriness | (noun) The quality of being introducing; of giving a preview or idea of. | - |
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| iodide | (noun) a salt or ester of hydriodic acid | - |
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| iodin | (noun) a nonmetallic element belonging to the halogens; used especially in medicine and photography and in dyes; occurs naturally only in combination in small quantities (as in sea water or rocks) | Synonyms: atomic number 53, I, iodine |
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| iodination | (noun) the substitution or addition of iodine atoms in organic compounds | - |
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| iodine | (noun) a tincture consisting of a solution of iodine in ethyl alcohol; applied topically to wounds as an antiseptic | Synonyms: tincture of iodine |
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| (noun) a nonmetallic element belonging to the halogens; used especially in medicine and photography and in dyes; occurs naturally only in combination in small quantities (as in sea water or rocks) | Synonyms: atomic number 53, I, iodin |
| 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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| iodoform | (noun) a yellowish crystalline solid with a penetrating odor; sometimes used as an antiseptic dressing | Synonyms: triiodomethane |
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| (noun) sweet smelling yellow solid haloform CHI3 | Synonyms: tri-iodomethane |
| iodoprotein | (noun) a protein that contains iodine | Synonyms: iodinated protein |
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| iodopsin | (noun) a violet photopigment in the retinal cones of the eyes of most vertebrates; plays a role in daylight vision | - |
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| iodothyronine | (noun) thyronine with iodine added | - |
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| iodotyrosine | (noun) tyrosine with iodine added | - |
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| ironwood | (noun) a small slow-growing deciduous tree of northern Iran having a low domed shape | Synonyms: iron-tree, iron tree, ironwood tree |
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| (noun) medium-sized hop hornbeam of eastern North America | Synonyms: Eastern hop hornbeam, ironwood tree, Ostrya virginiana |
| (noun) handsome East Indian evergreen tree often planted as an ornamental for its fragrant white flowers that yield a perfume; source of very heavy hardwood used for railroad ties | Synonyms: ironwood tree, Mesua ferrea, rose chestnut |
| (noun) exceptionally tough or hard wood of any of a number of ironwood trees | - |
| irreproducibility | (noun) the quality of being unreproducible | - |
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| isoantibody | (noun) an antibody that occurs naturally against foreign tissues from a person of the same species | Synonyms: alloantibody |
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| isopod | (noun) any of various small terrestrial or aquatic crustaceans with seven pairs of legs adapted for crawling | - |
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| ixodid | (noun) ticks having a hard shield on the back and mouth parts that project from the head | Synonyms: hard tick |
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| jodhpur | (noun) a short riding boot that fastens with a buckle at the side | Synonyms: jodhpur boot, jodhpur shoe |
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| jodhpurs | (noun) (used in the plural) flared trousers ending at the calves; worn with riding boots | Synonyms: jodhpur breeches, riding breeches |
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| joewood | (noun) West Indian shrub or small tree having leathery saponaceous leaves and extremely hard wood | Synonyms: barbasco, Jacquinia keyensis |
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| keratoderma | (noun) any skin disorder consisting of a growth that appears horny | Synonyms: keratodermia |
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| keratodermia | (noun) any skin disorder consisting of a growth that appears horny | Synonyms: keratoderma |
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| kingwood | (noun) Brazilian tree yielding a handsome cabinet wood | Synonyms: Dalbergia cearensis, kingwood tree |
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| (noun) handsome violet-streaked wood of the kingwood tree; used especially in cabinetwork | - |
| knighthood | (noun) aristocrats holding the rank of knight | - |
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| koodoo | (noun) either of two spiral-horned antelopes of the African bush | Synonyms: koudou, kudu |
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| labiodental | (noun) a consonant whose articulation involves the lips and teeth | Synonyms: labiodental consonant |
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| labyrinthodont | (noun) an amphibian of the superorder Labyrinthodontia | - |
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| lacepod | (noun) annual herb having pinnatifid basal leaves and slender racemes of small white flowers followed by one-seeded winged silicles | Synonyms: fringepod |
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| lacewood | (noun) variably colored and sometimes variegated hard tough elastic wood of a sycamore tree | Synonyms: sycamore |
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| lancewood | (noun) source of most of the lancewood of commerce | Synonyms: lancewood tree, Oxandra lanceolata |
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| (noun) durable straight-grained wood of the lacewood tree; used for building and cabinetwork and tools | - |
| laurelwood | (noun) tropical American tree; valued for its hard durable wood | Synonyms: Calophyllum candidissimum, lancewood tree |
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| leatherwood | (noun) deciduous shrub of eastern North America having tough flexible branches and pliable bark and small yellow flowers | Synonyms: Dirca palustris, moose-wood, moosewood, ropebark, wicopy |
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| (noun) shrub or small tree of southeastern United States to West Indies and Brazil; grown for the slender racemes of white flowers and orange and crimson foliage | Synonyms: cyrilla, Cyrilla racemiflora, white titi |
| lemonwood | (noun) South African evergreen having hard tough wood | Synonyms: lemon-wood, lemon-wood tree, lemonwood tree, Psychotria capensis |
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| (noun) hard tough elastic wood of the lemonwood tree; used for making bows and fishing rods | - |
| leptodactylid | (noun) toothed frogs: terrestrial or aquatic or arboreal | Synonyms: leptodactylid frog |
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| leukoderma | (noun) a congenital skin condition characterized by spots or bands of unpigmented skin | - |
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| levodopa | (noun) the levorotatory form of dopa (trade names Bendopa and Brocadopa and Larodopa); as a drug it is used to treat Parkinson's disease | Synonyms: Bendopa, Brocadopa, L-dopa, Larodopa |
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| lifeblood | (noun) an essential or life-giving force | - |
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| (noun) the blood considered as the seat of vitality | - |
| lightwood | (noun) tall Australian acacia yielding highly valued black timber | Synonyms: Acacia melanoxylon |
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| likelihood | (noun) the probability of a specified outcome | Synonyms: likeliness |
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| lingcod | (noun) food fish of the northern Pacific related to greenlings | Synonyms: Ophiodon elongatus |
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| (noun) the lean flesh of a fish caught off the Pacific coast of the United States | - |
| lipochondrodystrophy | (noun) hereditary disease (autosomal recessive) consisting of an error is mucopolysaccharide metabolism; characterized by severe abnormalities in development of skeletal cartilage and bone and mental retardation | Synonyms: dysostosis multiplex, gargoylism, Hurler's disease, Hurler's syndrome |
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| livelihood | (noun) the financial means whereby one lives | Synonyms: bread and butter, keep, living, support, sustenance |
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| lode | (noun) a deposit of valuable ore occurring within definite boundaries separating it from surrounding rocks | Synonyms: load |
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| lodestar | (noun) something that serves as a model or guide | Synonyms: loadstar |
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| (noun) guiding star; a star that is used as a reference point in navigation or astronomy | Synonyms: loadstar |
| lodestone | (noun) a permanent magnet consisting of magnetite that possess polarity and has the power to attract as well as to be attracted magnetically | Synonyms: loadstone |
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| lodge | (noun) any of various Native American dwellings | Synonyms: indian lodge |
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| (noun) a hotel providing overnight lodging for travelers | Synonyms: auberge, hostel, hostelry, inn |
| (noun) a small (rustic) house used as a temporary shelter | Synonyms: hunting lodge |
| (noun) small house at the entrance to the grounds of a country mansion; usually occupied by a gatekeeper or gardener | - |
| (noun) a formal association of people with similar interests | Synonyms: club, gild, guild, order, social club, society |
| lodgement | (noun) the state or quality of being lodged or fixed even temporarily | Synonyms: lodging, lodgment |
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| lodgepole | (noun) shrubby two-needled pine of coastal northwestern United States; red to yellow-brown bark fissured into small squares | Synonyms: lodgepole pine, Pinus contorta, shore pine, spruce pine |
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| lodger | (noun) a tenant in someone's house | Synonyms: boarder, roomer |
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| lodging | (noun) the act of lodging | - |
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| (noun) structures collectively in which people are housed | Synonyms: housing, living accommodations |
| (noun) the state or quality of being lodged or fixed even temporarily | Synonyms: lodgement, lodgment |
| lodgings | (noun) temporary living quarters | Synonyms: diggings, digs, domiciliation, pad |
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| lodgment | (noun) the state or quality of being lodged or fixed even temporarily | Synonyms: lodgement, lodging |
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| logwood | (noun) spiny shrub or small tree of Central America and West Indies having bipinnate leaves and racemes of small bright yellow flowers and yielding a hard brown or brownish-red heartwood used in preparing a black dye | Synonyms: bloodwood tree, campeachy, Haematoxylum campechianum, logwood tree |
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| (noun) very hard brown to brownish-red heartwood of a logwood tree; used in preparing a purplish red dye | - |
| loxodrome | (noun) a line on a sphere that cuts all meridians at the same angle; the path taken by a ship or plane that maintains a constant compass direction | Synonyms: rhumb, rhumb line |
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| lycopod | (noun) primitive evergreen moss-like plant with spores in club-shaped strobiles | Synonyms: club-moss, club moss |
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| magnetohydrodynamics | (noun) the study of the interaction of magnetic fields and electrically conducting fluids (as plasma or molten metal) | - |
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| maidenhood | (noun) the childhood of a girl | Synonyms: girlhood, maidhood |
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