| heelbone | (noun) the largest tarsal bone; forms the human heel | Synonyms: calcaneus, os tarsi fibulare |
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| heeltip | (noun) The bottom end of a heel, usually made of plastic or metal. | Synonyms: heel tip |
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| heft | (noun) the property of being large in mass | Synonyms: heftiness, massiveness, ponderosity, ponderousness |
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| (verb) lift or elevate | Synonyms: heave, heave up, heft up |
| (verb) test the weight of something by lifting it | - |
| heftiness | (noun) possessing muscular strength | Synonyms: brawn, brawniness, muscle, muscularity, sinew |
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| (noun) the property of being large in mass | Synonyms: heft, massiveness, ponderosity, ponderousness |
| hefty | (adjective) large in amount or extent or degree | Synonyms: goodish, goodly, healthy, respectable, sizable, sizeable, tidy |
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| (adjective) of considerable weight and size | - |
| (adjective) (of a person) possessing physical strength and weight; rugged and powerful | Synonyms: brawny, muscular, powerful, sinewy |
| hegari | (noun) Sudanese sorghums having white seeds; one variety grown in southwestern United States | - |
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| hegemon | (noun) a leading or paramount power | - |
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| hegemony | (noun) the dominance or leadership of one social group or nation over others | - |
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| hegira | (noun) a journey by a large group to escape from a hostile environment | Synonyms: exodus, hejira |
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| heifer | (noun) young cow | - |
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| height | (noun) the vertical dimension of extension; distance from the base of something to the top | Synonyms: tallness |
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| (noun) (of a standing person) the distance from head to foot | Synonyms: stature |
| (noun) elevation especially above sea level or above the earth's surface | Synonyms: altitude |
| (noun) the highest level or degree attainable; the highest stage of development | Synonyms: acme, elevation, meridian, peak, pinnacle, summit, superlative, tiptop, top |
| heighten | (verb) increase the level of | Synonyms: enhance, raise |
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| (verb) become more extreme | Synonyms: rise |
| (verb) make more extreme; raise in quantity, degree, or intensity | - |
| (verb) make more intense, stronger, or more marked | Synonyms: compound, deepen, intensify |
| (verb) make (one's senses) more acute | Synonyms: sharpen |
| (verb) increase the height of | - |
| heightening | (adjective) reaching a higher intensity | - |
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| heights | (noun) a high place | Synonyms: high |
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| heinous | (adjective) extremely wicked, deeply criminal | Synonyms: flagitious |
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| heinously | (adverb) in a terribly evil manner | Synonyms: monstrously |
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| heinousness | (noun) the quality of being shockingly cruel and inhumane | Synonyms: atrociousness, atrocity, barbarity, barbarousness |
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| heir | (noun) a person who is entitled by law or by the terms of a will to inherit the estate of another | Synonyms: heritor, inheritor |
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| (noun) a person who inherits some title or office | Synonyms: successor |
| heiress | (noun) a female heir | Synonyms: inheritress, inheritrix |
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| heirloom | (noun) something that has been in a family for generations | - |
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| (noun) (law) any property that is considered by law or custom as inseparable from an inheritance is inherited with that inheritance | - |
| heist | (noun) the act of stealing | Synonyms: rip-off |
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| (noun) robbery at gunpoint | Synonyms: armed robbery, holdup, stickup |
| (verb) commit a burglary; enter and rob a dwelling | Synonyms: burglarise, burglarize, burgle |
| hejira | (noun) a journey by a large group to escape from a hostile environment | Synonyms: exodus, hegira |
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| held | (adjective) occupied or in the control of; often used in combination | - |
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| heliac | (adjective) pertaining to or near the sun; especially the first rising of a star after and last setting before its invisibility owing to its conjunction with the sun | Synonyms: heliacal |
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| heliacal | (adjective) pertaining to or near the sun; especially the first rising of a star after and last setting before its invisibility owing to its conjunction with the sun | Synonyms: heliac |
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| helianthemum | (noun) any plant of the genus Helianthemum; vigorous plants of stony alpine meadows and dry scrub regions | Synonyms: sun rose, sunrose |
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| helianthus | (noun) any plant of the genus Helianthus having large flower heads with dark disk florets and showy yellow rays | Synonyms: sunflower |
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| helical | (adjective) in the shape of a coil | Synonyms: coiling, spiral, spiraling, spiralling, turbinate, volute, voluted, whorled |
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| helicon | (noun) a tuba that coils over the shoulder of the musician | Synonyms: bombardon |
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| helicopter | (noun) an aircraft without wings that obtains its lift from the rotation of overhead blades | Synonyms: chopper, eggbeater, whirlybird |
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| heliocentric | (adjective) having the sun as the center | - |
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| heliogram | (noun) a message transmitted by means of the sun's rays | - |
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| heliograph | (noun) an apparatus for sending telegraphic messages by using a mirror to turn the sun's rays off and on | - |
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| (verb) signal by means of a mirror and the using the sun's rays | - |
| heliogravure | (noun) an intaglio print produced by gravure | Synonyms: gravure, photogravure |
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| heliolatry | (noun) the worship of the sun | Synonyms: sun-worship |
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| heliometer | (noun) an instrument used to measure the angular separation of two stars that are too far apart to be included in the field of view of an ordinary telescope | - |
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| heliopause | (noun) the boundary marking the edge of the sun's influence; the boundary (roughly 100 AU from the sun) between the interplanetary medium and the interstellar medium; where the solar wind from the sun and the radiation from other stars meet | - |
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| heliophila | (noun) any of various South African herbs and subshrubs cultivated for long showy racemes of bright blue flowers with white eyes | - |
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| heliopsis | (noun) any North American shrubby perennial herb of the genus Heliopsis having large yellow daisylike flowers | Synonyms: oxeye |
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| heliosphere | (noun) the region inside the heliopause containing the sun and solar system | - |
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| heliotherapy | (noun) therapeutic exposure to sunlight | Synonyms: insolation |
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| heliotrope | (noun) green chalcedony with red spots that resemble blood | Synonyms: bloodstone |
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| heliotropism | (noun) an orienting response to the sun | - |
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| heliotype | (noun) duplicator consisting of a gelatin plate from which ink can be taken to make a copy | Synonyms: hectograph |
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| heliozoan | (noun) protozoa with spherical bodies and stiff radiating pseudopods | - |
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| heliport | (noun) an airport for helicopters | - |
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| helium | (noun) a very light colorless element that is one of the six inert gasses; the most difficult gas to liquefy; occurs in economically extractable amounts in certain natural gases (as those found in Texas and Kansas) | Synonyms: atomic number 2, He |
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| helix | (noun) a structure consisting of something wound in a continuous series of loops | Synonyms: coil, spiral, volute, whorl |
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| (noun) a curve that lies on the surface of a cylinder or cone and cuts the element at a constant angle | Synonyms: spiral |
| hell | (noun) noisy and unrestrained mischief | Synonyms: blaze |
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| (noun) a cause of difficulty and suffering | Synonyms: blaze |
| (noun) any place of pain and turmoil | Synonyms: hell on earth, hellhole, inferno, snake pit, the pits |
| hellbender | (noun) large salamander of North American rivers and streams | Synonyms: Cryptobranchus alleganiensis, mud puppy |
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| hellcat | (noun) a malicious woman with a fierce temper | Synonyms: harpy, vixen |
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| hellebore | (noun) any plant of the Eurasian genus Helleborus | - |
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| (noun) perennial herbs of the lily family having thick toxic rhizomes | Synonyms: false hellebore |
| helleborine | (noun) any of several orchids of the genus Cephalanthera | - |
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| (noun) any of various orchids of the genus Epipactis | - |
| (noun) any of several small temperate and tropical orchids having mottled or striped leaves and spikes of small yellowish-white flowers in a twisted raceme | Synonyms: rattlesnake plantain |
| heller | (noun) a rowdy or mischievous person (usually a young man) | Synonyms: devil, hellion |
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| (noun) 100 halers equal 1 koruna in Czech Republic | Synonyms: haler |
| (noun) 100 halers equal 1 koruna Slovakia | Synonyms: haler |
| helleri | (noun) freshwater fish of Central America having a long swordlike tail; popular aquarium fish | Synonyms: swordtail, topminnow, Xyphophorus helleri |
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| hellfire | (noun) a place of eternal fire envisaged as punishment for the damned | Synonyms: red region |
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| hellgrammiate | (noun) large brown aquatic larva of the dobsonfly; used as fishing bait | Synonyms: dobson |
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| hellhole | (noun) any place of pain and turmoil | Synonyms: hell, hell on earth, inferno, snake pit, the pits |
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| hellhound | (noun) a very evil man | - |
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| (noun) (Greek mythology) the three-headed dog guarding the entrance to Hades; son of Typhon | Synonyms: Cerberus |
| hellion | (noun) a rowdy or mischievous person (usually a young man) | Synonyms: devil, heller |
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| hellish | (adjective) extremely evil or cruel; expressive of cruelty or befitting hell | Synonyms: demonic, diabolic, diabolical, fiendish, infernal, satanic, unholy |
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| (adjective) (informal) very unpleasant | Synonyms: beastly, god-awful |
| hellishly | (adverb) diabolically | Synonyms: infernally |
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| hellishness | (noun) The property of being extremely bad, miserable, difficult or terrifying; resembling a nightmare. | Synonyms: nightmarishness |
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| hello | (noun) an expression of greeting | Synonyms: hi, how-do-you-do, howdy, hullo |
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| helm | (noun) (figurative) a position of leadership | - |
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| (noun) steering mechanism for a vessel; a mechanical device by which a vessel is steered | - |
| (verb) be at or take the helm of | - |
| helmet | (noun) a protective headgear made of hard material to resist blows | - |
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| (noun) armor plate that protects the head | - |
| helmeted | (adjective) equipped with or wearing a helmet | - |
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| helmetflower | (noun) a herbaceous plant of the genus Scutellaria which has a calyx that, when inverted, resembles a helmet with its visor raised | Synonyms: skullcap |
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| (noun) a poisonous herb native to northern Europe having hooded blue-purple flowers; the dried leaves and roots yield aconite | Synonyms: Aconitum napellus, helmet flower, monkshood |
| (noun) any of several orchids of the genus Coryanthes having racemes of a few musky-scented waxy flowers with a helmet-shaped lip process | Synonyms: helmet orchid |
| helminth | (noun) worm that is parasitic on the intestines of vertebrates especially roundworms and tapeworms and flukes | Synonyms: parasitic worm |
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| helminthiasis | (noun) infestation of the body with parasitic worms | - |
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| helminthic | (adjective) capable of expelling or destroying parasitic worms | Synonyms: anthelminthic, anthelmintic, parasiticidal |
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| (noun) a medication capable of causing the evacuation of parasitic intestinal worms | Synonyms: anthelminthic, anthelmintic, vermifuge |
| helmsman | (noun) the person who steers a ship | Synonyms: steerer, steersman |
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| helot | (noun) (Middle Ages) a person who is bound to the land and owned by the feudal lord | Synonyms: serf, villein |
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| help | (noun) the activity of contributing to the fulfillment of a need or furtherance of an effort or purpose | Synonyms: aid, assist, assistance |
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| (noun) a person or thing that is a resource that helps make something easier or possible to do | Synonyms: aid, assistance |
| (noun) a means of serving | Synonyms: avail, service |
| (noun) a person who contributes to the fulfillment of a need or furtherance of an effort or purpose | Synonyms: assistant, helper, supporter |
| (verb) improve the condition of | Synonyms: aid |
| (verb) improve; change for the better | - |
| (verb) help to some food; help with food or drink | Synonyms: serve |
| (verb) take or use | Synonyms: avail |
| (verb) give help or assistance; be of service | Synonyms: aid, assist |
| (verb) contribute to the furtherance of | - |
| (verb) be of use | Synonyms: facilitate |
| (verb) abstain from doing; always used with a negative | Synonyms: help oneself |
| helpdesk | (noun) a service that provides information and assistance to the users of a computer network | Synonyms: help desk |
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| helper | (noun) a person who helps people or institutions (especially with financial help) | Synonyms: benefactor |
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| (noun) a person who contributes to the fulfillment of a need or furtherance of an effort or purpose | Synonyms: assistant, help, supporter |
| helpful | (adjective) providing assistance or serving a useful function | - |
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| helpfully | (adverb) in a helpful manner | - |
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| helpfulness | (noun) the property of providing useful assistance | - |
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| (noun) friendliness evidence by a kindly and helpful disposition | Synonyms: kindliness |
| helping | (noun) an individual quantity of food or drink taken as part of a meal | Synonyms: portion, serving |
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| helpless | (adjective) unable to manage independently | - |
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| (adjective) unable to function; without help | Synonyms: lost |
| (adjective) lacking in or deprived of strength or power | Synonyms: incapacitated |
| helplessly | (adverb) in a helpless manner | Synonyms: impotently |
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| helplessness | (noun) powerlessness revealed by an inability to act | Synonyms: impuissance, weakness |
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| (noun) a feeling of being unable to manage | - |
| (noun) the state of needing help from something | - |
| helpmate | (noun) a helpful partner | Synonyms: helpmeet |
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| helpmeet | (noun) a helpful partner | Synonyms: helpmate |
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| helve | (noun) the handle of a weapon or tool | Synonyms: haft |
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| helvella | (noun) any fungus of the genus Helvella having the ascocarps stalked or pleated or often in folds | - |
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| hem | (noun) the edge of a piece of cloth; especially the finished edge that has been doubled under and stitched down | - |
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| (noun) the utterance of a sound similar to clearing the throat; intended to get attention, express hesitancy, fill a pause, hide embarrassment, warn a friend, etc. | Synonyms: ahem |
| (verb) utter `hem' or `ahem' | - |
| (verb) fold over and sew together to provide with a hem | - |
| 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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