| goodbye | (noun) a farewell remark | Synonyms: adieu, adios, arrivederci, au revoir, auf wiedersehen, bye-bye, bye, cheerio, good-by, good-bye, good day, goodby, sayonara, so long |
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| goodish | (adjective) large in amount or extent or degree | Synonyms: goodly, healthy, hefty, respectable, sizable, sizeable, tidy |
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| (adjective) moderately good of its kind | - |
| goodly | (adjective) large in amount or extent or degree | Synonyms: goodish, healthy, hefty, respectable, sizable, sizeable, tidy |
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| goodness | (noun) moral excellence or admirableness | Synonyms: good |
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| (noun) that which is pleasing or valuable or useful | Synonyms: good |
| goodwill | (noun) a disposition to kindness and compassion | Synonyms: good will, grace |
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| (noun) the friendly hope that something will succeed | Synonyms: good will |
| (noun) (accounting) an intangible asset valued according to the advantage or reputation a business has acquired (over and above its tangible assets) | Synonyms: good will |
| goody | (noun) something considered choice to eat | Synonyms: dainty, delicacy, kickshaw, treat |
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| gopherwood | (noun) small handsome roundheaded deciduous tree having showy white flowers in terminal clusters and heavy hardwood yielding yellow dye | Synonyms: Cladrastis kentukea, Cladrastis lutea, Kentucky yellowwood |
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| greasewood | (noun) low hardy much-branched spiny shrub common in alkaline soils of western America | Synonyms: black greasewood, Sarcobatus vermiculatus |
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| greenhood | (noun) any of numerous orchids of the genus Pterostylis having leaves in a basal rosette and green flowers often striped purple or brown or red with the dorsal sepal incurved to form a hood | Synonyms: helmet orchid |
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| greenwood | (noun) woodlands in full leaf | - |
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| gumwood | (noun) wood or lumber from any of various gum trees especially the sweet gum | Synonyms: gum |
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| 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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| hemodynamic | (adjective) or of relating to or involved in hemodynamics | - |
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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 | (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 |
| heterodactyl | (adjective) (of bird feet) having the first and second toes directed backward the third and fourth forward | - |
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| heterodox | (adjective) characterized by departure from accepted beliefs or standards | Synonyms: dissident, heretical |
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| 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 |
| heterodyne | (adjective) of or relating to the beat produced by heterodyning two oscillations | - |
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| (verb) combine (a radio frequency wave) with a locally generated wave of a different frequency so as to produce a new frequency equal to the sum or the difference between the two | - |
| 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 |
| (verb) cover with a hood | - |
| 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 | - |
| (verb) bring bad luck; be a source of misfortune | - |
| 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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| hoodwink | (verb) conceal one's true motives from especially by elaborately feigning good intentions so as to gain an end | Synonyms: bamboozle, lead by the nose, play false, pull the wool over someone's eyes, snow |
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| (verb) influence by slyness | Synonyms: beguile, juggle |
| 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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| hydrodynamic | (adjective) of or relating to hydrodynamics | - |
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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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| hypodermal | (adjective) of or relating to the hypodermis | - |
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| hypodermic | (adjective) relating to or located below the epidermis | Synonyms: subcutaneous |
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| (noun) a piston syringe that is fitted with a hypodermic needle for giving injections | Synonyms: hypo, hypodermic syringe |
| 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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| immoderate | (adjective) beyond reasonable limits | - |
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| immoderately | (adverb) without moderation; in an immoderate manner | - |
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| (adverb) to a degree that exceeds the bounds of reason or moderation | Synonyms: unreasonably |
| 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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| immodest | (adjective) lacking decorum or decency | - |
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| (adjective) having or showing an exaggerated opinion of your importance, ability, etc | - |
| immodestly | (adverb) without modesty; in an immodest manner | - |
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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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| immunodeficient | (adjective) incapable of developing an immune response following exposure to an antigen | - |
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| implode | (verb) burst inward | Synonyms: go off |
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| incommode | (verb) to cause inconvenience or discomfort to | Synonyms: bother, discommode, disoblige, inconvenience, put out, trouble |
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| incommodious | (adjective) uncomfortably or inconveniently small | - |
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| incommodiousness | (noun) an inconvenient discomfort | Synonyms: inconvenience |
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| inodorous | (adjective) having no odor | Synonyms: odorless, odourless |
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| instagood | (adjective) likely to get many upvotes on Instagram | - |
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| internode | (noun) a segment of a stem between two nodes | - |
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| introduce | (verb) be a precursor of | Synonyms: inaugurate, usher in |
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| (verb) place, fit, or thrust (something) into another thing | Synonyms: enclose, inclose, insert, put in, stick in |
| (verb) put before (a body) | - |
| (verb) cause to come to know personally | Synonyms: acquaint, present |
| (verb) furnish with a preface or introduction | Synonyms: precede, preface, premise |
| (verb) bring before the public for the first time, as of an actor, song, etc. | Synonyms: bring out |
| (verb) put or introduce into something | Synonyms: enter, infix, insert |
| (verb) bring something new to an environment | Synonyms: innovate |
| (verb) bring in or establish in a new place or environment | - |
| (verb) bring in a new person or object into a familiar environment | Synonyms: bring in |
| 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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| introductory | (adjective) serving as a base or starting point | Synonyms: basic |
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| (adjective) serving to open or begin | - |
| (adjective) serving as an introduction or preface | Synonyms: prefatorial, prefatory |
| 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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| iodinate | (verb) cause to combine with iodine | - |
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| iodinated | (adjective) treated with iodine | Synonyms: iodised, iodized |
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| iodinating | (adjective) combining or causing to combine with 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 |
| iodise | (verb) treat with iodine so as to prevent infection | Synonyms: iodize |
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| (verb) treat with iodine | Synonyms: iodize |
| iodised | (adjective) treated with iodine | Synonyms: iodinated, iodized |
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| iodize | (verb) treat with iodine so as to prevent infection | Synonyms: iodise |
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| (verb) treat with iodine | Synonyms: iodise |
| iodized | (adjective) treated with iodine | Synonyms: iodinated, iodised |
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| 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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| ironshod | (adjective) shod or cased with iron | - |
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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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| irreproducible | (adjective) impossible to reproduce or duplicate | Synonyms: 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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