| headboard | (noun) a vertical board or panel forming the head of a bedstead | - |
|---|
| headland | (noun) a natural elevation (especially a rocky one that juts out into the sea) | Synonyms: foreland, head, promontory |
|---|
| headstand | (noun) an acrobatic feat in which a person balances on the head (usually with the help of the hands) | - |
|---|
| headwind | (noun) wind blowing opposite to the path of a ship or aircraft | - |
|---|
| headword | (noun) a word placed at the beginning of a line or paragraph (as in a dictionary entry) | - |
|---|
| (noun) a content word that can be qualified by a modifier | Synonyms: head word |
| heartland | (noun) the central region of a country or continent; especially a region that is important to a country or to a culture | - |
|---|
| heartseed | (noun) herbaceous vine of tropical America and Africa | Synonyms: Cardiospermum grandiflorum |
|---|
| heartwood | (noun) the older inactive central wood of a tree or woody plant; usually darker and denser than the surrounding sapwood | Synonyms: duramen |
|---|
| heathland | (noun) a tract of level wasteland; uncultivated land with sandy soil and scrubby vegetation | Synonyms: heath |
|---|
| hebdomad | (noun) any period of seven consecutive days | Synonyms: week |
|---|
| hedgefund | (noun) a flexible investment company for a small number of large investors (usually the minimum investment is $1 million); can use high-risk techniques (not allowed for mutual funds) such as short-selling and heavy leveraging | Synonyms: hedge fund |
|---|
| heed | (noun) paying particular notice (as to children or helpless people) | Synonyms: attentiveness, paying attention, regard |
|---|
| hellhound | (noun) a very evil man | - |
|---|
| (noun) (Greek mythology) the three-headed dog guarding the entrance to Hades; son of Typhon | Synonyms: Cerberus |
| hemerobiid | (noun) small dark-colored lacewing fly | Synonyms: brown lacewing, hemerobiid fly |
|---|
| hemorrhoid | (noun) venous swelling external or internal to the anal sphincter | Synonyms: haemorrhoid, piles |
|---|
| heptad | (noun) the cardinal number that is the sum of six and one | Synonyms: 7, septenary, septet, seven, sevener, VII |
|---|
| herald | (noun) something that precedes and indicates the approach of something or someone | Synonyms: forerunner, harbinger, precursor, predecessor |
|---|
| (noun) (formal) a person who announces important news | Synonyms: trumpeter |
| herd | (noun) a group of cattle or sheep or other domestic mammals all of the same kind that are herded by humans | - |
|---|
| (noun) a group of wild mammals of one species that remain together: antelope or elephants or seals or whales or zebra | - |
| (noun) a crowd especially of ordinary or undistinguished persons or things | Synonyms: ruck |
| heteroploid | (noun) (genetics) an organism or cell having a chromosome number that is not an even multiple of the haploid chromosome number for that species | - |
|---|
| hexad | (noun) the cardinal number that is the sum of five and one | Synonyms: 6, Captain Hicks, half a dozen, sestet, sextet, sextuplet, sise, six, sixer, VI |
|---|
| hexapod | (noun) an animal having six feet | - |
|---|
| highboard | (noun) a high diving board | - |
|---|
| highland | (noun) elevated (e.g., mountainous) land | Synonyms: upland |
|---|
| highroad | (noun) a highway | Synonyms: trunk road |
|---|
| hind | (noun) a female deer, especially an adult female red deer | - |
|---|
| (noun) any of several mostly spotted fishes that resemble groupers | - |
| hinterland | (noun) a remote and undeveloped area | Synonyms: back country, backwoods, boondocks |
|---|
| hippoboscid | (noun) bloodsucking dipterous fly parasitic on birds and mammals | Synonyms: louse fly |
|---|
| hoard | (noun) a secret store of valuables or money | Synonyms: cache, stash |
|---|
| hod | (noun) an open box attached to a long pole handle; bricks or mortar are carried on the shoulder | - |
|---|
| hogshead | (noun) a large cask especially one holding 63 gals | - |
|---|
| (noun) a British unit of capacity for alcoholic beverages | - |
| hogweed | (noun) tall coarse plant having thick stems and cluster of white to purple flowers | Synonyms: cow parsnip, Heracleum sphondylium |
|---|
| hold | (noun) the act of grasping | Synonyms: clasp, clench, clutch, clutches, grasp, grip |
|---|
| (noun) the appendage to an object that is designed to be held in order to use or move it | Synonyms: grip, handgrip, handle |
| (noun) a cell in a jail or prison | Synonyms: keep |
| (noun) the space in a ship or aircraft for storing cargo | Synonyms: cargo area, cargo deck, cargo hold, storage area |
| (noun) a stronghold | - |
| (noun) power by which something or someone is affected or dominated | - |
| (noun) understanding of the nature or meaning or quality or magnitude of something | Synonyms: appreciation, grasp |
| (noun) a state of being confined (usually for a short time) | Synonyms: custody, detainment, detention |
| (noun) time during which some action is awaited | Synonyms: delay, postponement, time lag, wait |
| homebound | (noun) people who are confined to their homes | - |
|---|
| homeland | (noun) the country where you were born | Synonyms: country of origin, fatherland, mother country, motherland, native land |
|---|
| homestead | (noun) dwelling that is usually a farmhouse and adjoining land | - |
|---|
| (noun) the home and adjacent grounds occupied by a family | - |
| (noun) land acquired from the United States public lands by filing a record and living on and cultivating it under the homestead law | - |
| hominid | (noun) a primate of the family Hominidae | - |
|---|
| hominoid | (noun) a primate of the superfamily Hominoidea | - |
|---|
| hood | (noun) (zoology) an expandable part or marking that resembles a hood on the head or neck of an animal | - |
|---|
| (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 |
| hoodmold | (noun) a protective drip that is made of stone | Synonyms: dripstone, hoodmould |
|---|
| hoodmould | (noun) a protective drip that is made of stone | Synonyms: dripstone, hoodmold |
|---|
| horehound | (noun) a candy that is flavored with an extract of the horehound plant | - |
|---|
| (noun) any of various aromatic herbs of the genus Marrubium | - |
| horsehead | (noun) any of several silvery marine fishes with very flat bodies | Synonyms: Atlantic moonfish, dollarfish, horse-head, horsefish, moonfish, Selene setapinnis |
|---|
| horsepond | (noun) a pond for watering horses | - |
|---|
| horseweed | (noun) common North American weed with linear leaves and small discoid heads of yellowish flowers; widely naturalized throughout temperate regions; sometimes placed in genus Erigeron | Synonyms: Canadian fleabane, Conyza canadensis, Erigeron canadensis, fleabane |
|---|
| (noun) erect perennial strong-scented with serrate pointed leaves and a loose panicle of yellowish flowers; the eastern United States | Synonyms: Collinsonia canadensis, horse balm, richweed, stone-root, stone root, stoneroot |
| hotbed | (noun) a bed of earth covered with glass and heated by rotting manure to promote the growth of plants | - |
|---|
| (noun) a situation that is ideal for rapid development (especially of something bad) | - |
| hothead | (noun) a reckless impetuous irresponsible person | Synonyms: daredevil, harum-scarum, lunatic, madcap, swashbuckler |
|---|
| (noun) a belligerent grouch | Synonyms: fire-eater |
| hound | (noun) any of several breeds of dog used for hunting typically having large drooping ears | Synonyms: hound dog |
|---|
| (noun) someone who is morally reprehensible | Synonyms: blackguard, bounder, cad, dog, heel |
| household | (noun) a social unit living together | Synonyms: family, home, house, menage |
|---|
| househusband | (noun) a husband who keeps house while his wife earns the family income | Synonyms: house husband |
|---|
| housemaid | (noun) a female domestic | Synonyms: amah, maid, maidservant |
|---|
| hoverboard | (noun) A device resembling a skateboard without wheels that can hover above the ground | - |
|---|
| hudood | (noun) Islamic laws stating the limits ordained by Allah and including the deterrent punishments for serious crimes | Synonyms: hudud |
|---|
| hudud | (noun) Islamic laws stating the limits ordained by Allah and including the deterrent punishments for serious crimes | Synonyms: hudood |
|---|
| humankind | (noun) all of the living human inhabitants of the earth | Synonyms: human beings, human race, humanity, humans, man, mankind, world |
|---|
| humanoid | (noun) an automaton that resembles a human being | Synonyms: android, mechanical man |
|---|
| hummingbird | (noun) tiny American bird having brilliant iridescent plumage and long slender bills; wings are specialized for vibrating flight | - |
|---|
| hundred | (noun) ten 10s | Synonyms: 100, C, century, one C |
|---|
| husband | (noun) a married man; a woman's partner in marriage | Synonyms: hubby, married man |
|---|
| hyaloid | (noun) the transparent membrane enveloping the vitreous humor of the eye and separating it from the retina | Synonyms: hyaloid membrane |
|---|
| hybrid | (noun) (genetics) an organism that is the offspring of genetically dissimilar parents or stock; especially offspring produced by breeding plants or animals of different varieties or breeds or species | Synonyms: cross, crossbreed |
|---|
| (noun) a car which runs on two power sources, usually an internal combustion engine and an electronic motor | Synonyms: hybrid car |
| (noun) a composite of mixed origin | - |
| (noun) a word that is composed of parts from different languages (e.g., `monolingual' has a Greek prefix and a Latin root) | Synonyms: loan-blend, loanblend |
| hydatid | (noun) cyst filled with liquid; forms as a result of infestation by tapeworm larvae (as in echinococcosis) | - |
|---|
| hydrocolloid | (noun) a substance that forms a gel with water | - |
|---|
| hydroid | (noun) colonial coelenterates having the polyp phase dominant | Synonyms: hydrozoan |
|---|
| hyoid | (noun) a U-shaped bone at the base of the tongue that supports the tongue muscles | Synonyms: hyoid bone, os hyoideum |
|---|
| hyperboloid | (noun) a quadric surface generated by rotating a hyperbola around its main axis | - |
|---|
| hypocycloid | (noun) a line generated by a point on a circle that rolls around inside another circle | - |
|---|
| id | (noun) (psychoanalysis) primitive instincts and energies underlying all psychic activity | - |
|---|
| iguanid | (noun) lizards of the New World and Madagascar and some Pacific islands; typically having a long tail and bright throat patch in males | Synonyms: iguanid lizard |
|---|
| ijtihad | (noun) the endeavor of a Muslim scholar to derive a rule of divine law from the Koran and Hadith without relying on the views of other scholars; by the end of the 10th century theologians decided that debate on such matters would be closed and Muslim theology and law were frozen | - |
|---|
| infield | (noun) the area of a baseball field that is enclosed by 3 bases and home plate | Synonyms: baseball diamond, diamond |
|---|
| infrared | (noun) the infrared region of the electromagnetic spectrum; electromagnetic wave frequencies below the visible range | Synonyms: infrared frequency |
|---|
| (noun) electromagnetic radiation with wavelengths longer than visible light but shorter than radio waves | Synonyms: infrared emission, infrared light, infrared radiation |
| inkpad | (noun) a block of absorbent material saturated with ink; used to transfer ink evenly to a rubber stamp | Synonyms: inking pad, pad, stamp pad |
|---|
| inkstand | (noun) a tray or stand for writing implements and containers for ink | - |
|---|
| (noun) a small well holding writing ink into which a pen can be dipped | Synonyms: inkwell |
| inroad | (noun) an invasion or hostile attack | - |
|---|
| (noun) an encroachment or intrusion | - |
| insured | (noun) a person whose interests are protected by an insurance policy; a person who contracts for an insurance policy that indemnifies him against loss of property or life or health etc. | Synonyms: insured person |
|---|
| invalid | (noun) someone who is incapacitated by a chronic illness or injury | Synonyms: shut-in |
|---|
| iodocompound | (noun) a compound containing the covalent iodine radical | - |
|---|
| ironclad | (noun) a wooden warship of the 19th century that is plated with iron or steel armor | - |
|---|
| ironweed | (noun) any of various plants of the genus Vernonia of tropical and warm regions of especially North America that take their name from their loose heads of purple to rose flowers that quickly take on a rusty hue | Synonyms: vernonia |
|---|
| ironwood | (noun) a small slow-growing deciduous tree of northern Iran having a low domed shape | Synonyms: iron-tree, iron tree, ironwood tree |
|---|
| (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 | - |
| island | (noun) a zone or area resembling an island | - |
|---|
| (noun) a land mass (smaller than a continent) that is surrounded by water | - |
| isocarboxazid | (noun) a monoamine oxidase inhibitor (trade name Marplan) that is used to treat clinical depression | Synonyms: Marplan |
|---|
| isoniazid | (noun) antibacterial drug (trade name Nydrazid) used to treat tuberculosis | Synonyms: INH, Nydrazid |
|---|
| isopod | (noun) any of various small terrestrial or aquatic crustaceans with seven pairs of legs adapted for crawling | - |
|---|
| ixodid | (noun) ticks having a hard shield on the back and mouth parts that project from the head | Synonyms: hard tick |
|---|
| izzard | (noun) the 26th letter of the Roman alphabet | Synonyms: ezed, Z, z, zed, zee |
|---|
| jacquard | (noun) a highly figured fabric woven on a Jacquard loom | - |
|---|
| jailbird | (noun) a criminal who has been jailed repeatedly | Synonyms: gaolbird, jail bird |
|---|
| jassid | (noun) a variety of leafhopper | - |
|---|
| jaybird | (noun) common jay of eastern North America; bright blue with grey breast | Synonyms: blue jay, Cyanocitta cristata |
|---|
| jehad | (noun) a holy struggle or striving by a Muslim for a moral or spiritual or political goal | Synonyms: jihad |
|---|
| jeremiad | (noun) a long and mournful complaint | - |
|---|
| jewelweed | (noun) North American annual plant with usually yellow or orange flowers; grows chiefly on wet rather acid soil | Synonyms: celandine, Impatiens capensis, lady's earrings, orange balsam, touch-me-not |
|---|
| jihad | (noun) a holy struggle or striving by a Muslim for a moral or spiritual or political goal | Synonyms: jehad |
|---|
| jimsonweed | (noun) intensely poisonous tall coarse annual tropical weed having rank-smelling foliage, large white or violet trumpet-shaped flowers and prickly fruits | Synonyms: apple of Peru, common thorn apple, Datura stramonium, Jamestown weed, jimson weed |
|---|
| jird | (noun) gerbil of northern Africa | - |
|---|
| jnd | (noun) (psychophysics) the difference between two stimuli that (under properly controlled experimental conditions) is detected as often as it is undetected | Synonyms: just-noticeable difference |
|---|
| joewood | (noun) West Indian shrub or small tree having leathery saponaceous leaves and extremely hard wood | Synonyms: barbasco, Jacquinia keyensis |
|---|
| junkyard | (noun) a field where junk is collected and stored for resale | - |
|---|
| katydid | (noun) large green long-horned grasshopper of North America; males produce shrill sounds by rubbing together special organs on the forewings | - |
|---|