| anopheline | (noun) any mosquito of the genus Anopheles | - |
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| anthelminthic | (noun) a medication capable of causing the evacuation of parasitic intestinal worms | Synonyms: anthelmintic, helminthic, vermifuge |
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| anthelmintic | (noun) a medication capable of causing the evacuation of parasitic intestinal worms | Synonyms: anthelminthic, helminthic, vermifuge |
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| aphelion | (noun) apoapsis in solar orbit; the point in the orbit of a planet or comet that is at the greatest distance from the sun | - |
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| bachelor | (noun) a man who has never been married | Synonyms: unmarried man |
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| (noun) a knight of the lowest order; could display only a pennon | Synonyms: bachelor-at-arms, knight bachelor |
| bachelorette | (noun) a young unmarried woman who lives alone | Synonyms: bachelor girl |
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| bachelorhood | (noun) the state of being an unmarried man | - |
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| (noun) the time of a man's life prior to marriage | - |
| bethel | (noun) a house of worship (especially one for sailors) | - |
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| bombshell | (noun) an explosive bomb or artillery shell | - |
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| (noun) a shocking surprise | Synonyms: thunderbolt, thunderclap |
| (noun) an entertainer who has a sensational effect | - |
| bookshelf | (noun) a shelf on which to keep books | - |
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| brothel | (noun) a building where prostitutes are available | Synonyms: bagnio, bawdyhouse, bordello, cathouse, house of ill repute, house of prostitution, sporting house, whorehouse |
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| bushel | (noun) a British imperial capacity measure (liquid or dry) equal to 4 pecks | - |
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| (noun) a United States dry measure equal to 4 pecks or 2152.42 cubic inches | - |
| chela | (noun) a Hindu disciple of a swami | - |
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| (noun) a grasping structure on the limb of a crustacean or other arthropods | Synonyms: claw, nipper, pincer |
| chelate | (noun) a heterocyclic compound having a metal ion attached by coordinate bonds to at least two nonmetal ions | Synonyms: chelate compound |
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| chelation | (noun) the process of forming a ring by forming one or more hydrogen bonds | - |
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| (noun) (medicine) the process of removing a heavy metal from the bloodstream by means of a chelate as in treating lead or mercury poisoning | - |
| chelicera | (noun) either of the first pair of fang-like appendages near the mouth of an arachnid; often modified for grasping and piercing | - |
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| cheloid | (noun) raised pinkish scar tissue at the site of an injury; results from excessive tissue repair | Synonyms: keloid |
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| chelonian | (noun) a reptile of the order Chelonia | Synonyms: chelonian reptile |
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| clamshell | (noun) the shell of a clam | - |
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| (noun) a dredging bucket with hinges like the shell of a clam | Synonyms: grapple |
| cockleshell | (noun) a small light flimsy boat | - |
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| echelon | (noun) a diffraction grating consisting of a pile of plates of equal thickness arranged stepwise with a constant offset | - |
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| (noun) a body of troops arranged in a line | - |
| (noun) status in a society or organization | - |
| eggshell | (noun) the exterior covering of a bird's egg | Synonyms: shell |
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| endothelium | (noun) an epithelium of mesoblastic origin; a thin layer of flattened cells that lines the inside of some body cavities | - |
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| epithelioma | (noun) a malignant tumor of the epithelial tissue | - |
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| epithelium | (noun) membranous tissue covering internal organs and other internal surfaces of the body | Synonyms: epithelial tissue |
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| hatchel | (noun) a comb for separating flax fibers | Synonyms: heckle |
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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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| 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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| 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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| 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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| 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 | - |
| helmet | (noun) a protective headgear made of hard material to resist blows | - |
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| (noun) armor plate that protects the head | - |
| 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 | (noun) a medication capable of causing the evacuation of parasitic intestinal worms | Synonyms: anthelminthic, anthelmintic, vermifuge |
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| 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 |
| 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 |
| 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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| 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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| isohel | (noun) an isogram connecting points receiving equal amounts of sunshine | - |
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| lampshell | (noun) marine animal with bivalve shell having a pair of arms bearing tentacles for capturing food; found worldwide | Synonyms: brachiopod, lamp shell |
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| lorchel | (noun) a large fungus of the family Helvellaceae | - |
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| mesothelioma | (noun) a form of carcinoma of the mesothelium lining lungs or abdomen or heart; usually associated with exposure to asbestos dust | - |
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| mesothelium | (noun) epithelium originating in the embryonic mesoderm; lines the primordial body cavity | - |
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| moonshell | (noun) marine gastropods having smooth rounded shells that form short spires | Synonyms: moon shell |
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| nepheline | (noun) a whitish mineral consisting of sodium aluminum silicate or potassium aluminum silicate in crystalline form; used in the manufacture of ceramics and enamels | Synonyms: nephelite |
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| nephelinite | (noun) an igneous rock consisting of nepheline and pyroxene | - |
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| nephelite | (noun) a whitish mineral consisting of sodium aluminum silicate or potassium aluminum silicate in crystalline form; used in the manufacture of ceramics and enamels | Synonyms: nepheline |
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| neuroepithelioma | (noun) malignant tumor of the neuroepithelium | - |
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| neuroepithelium | (noun) epithelium associated with special sense organs and containing sensory nerve endings | - |
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| nutshell | (noun) the shell around the kernel of a nut | - |
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| parhelion | (noun) a bright spot on the parhelic circle; caused by diffraction by ice crystals | Synonyms: mock sun, sundog |
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| perihelion | (noun) periapsis in solar orbit; the point in the orbit of a planet or comet where it is nearest to the sun | - |
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| perithelium | (noun) tissue layer around small blood vessels | - |
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| phellem | (noun) (botany) outer tissue of bark; a protective layer of dead cells | Synonyms: cork |
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| philhellene | (noun) an admirer of Greece and everything Greek | Synonyms: Graecophile, philhellenist |
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| philhellenism | (noun) admiration for Greece and the Greeks and Greek customs | - |
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| philhellenist | (noun) an admirer of Greece and everything Greek | Synonyms: Graecophile, philhellene |
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| photoheliograph | (noun) a telescope, with a camera attached, used to photograph the Sun. | - |
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| platyhelminth | (noun) parasitic or free-living worms having a flattened body | Synonyms: flatworm |
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