Skip to content A B C D E F G H I J K L M N O P Q R S T U V W X Y Z hekistotherm A plant that needs little heat and can withstand long periods of darkness. Hekla A stratovolcano in the south of Iceland. Hekmatnejad A surname from Persian. Hekou A Yao autonomous county in Honghe prefecture, Yunnan, China, near Lào Cai, Vietnam. hekte an ancient coin from Asia Minor, struck in silver or electrum and valued at one sixth of a stater hekteus An Ancient Greek unit of volume, one sixth of a medimnos. Hektorean Of or relating to the hero Hektor in the Iliad. Hel The goddess of the realm of the unheroic dead, a daughter of Loki by the jotun Angrboða. helado Spanish or Latin American ice cream. Helaegon The canonical incestuous ship of fictional siblings Helaena Targaryen and Aegon II Targaryen from Fire & Blood and its television adaptation House of the Dragon. Helaemond The incestuous ship of fictional siblings Helaena Targaryen and Aemond Targaryen from Fire & Blood and its television adaptation House of the Dragon. helaletid Any extinct tapir of the family Helaletidae Helan A county of Yinchuan, Ningxia autonomous region, China. Helatrobus An "interplanetary nation" which existed trillions of years ago, the reasons for the demise of which are uncertain. Helberg A surname. Helbert A surname. Helbig A surname. Helbling A surname. helborside A particular steroid glycoside. helcionellacean Any mollusc of the superfamily †Helcionellacea. helcionellid Any extinct mollusk in the family Helcionellidae. helcoid Of or pertaining to an ulcer; ulcerous. helcology The study, pathology, and treatment of ulcers. helcomyzid Any fly of the family Helcomyzidae. helcosis ulceration heldentenor A singer with a deep, strong voice that spans the range between baritone and tenor helder Rather. Helderman A surname from German. Heldman A surname from German. Heldreich A surname from German. Heldt A surname. hele To hide, conceal, and keep secret, especially for a secret society (such as the masons). heleia Any of various birds in genus Heleia, of Indonesia and the Philippines. heleid Any biting midge in the family Heleidae, a synonym of the Ceratopogonidae. helek A unit of time equal to an eighteenth of a minute (3⅓ seconds) helen Any of various papilionid butterflies of the genus Papilio. Helena A female given name from Ancient Greek. helenalin A highly toxic sesquiterpene lactone found in Arnica montana and Arnica chamissonis subsp. foliosa. Helendale An unincorporated community and census-designated place in the Mojave Desert, San Bernardino County, California, United States. Helene A female given name from Ancient Greek. Helenean Of or relating to Helen, the daughter of Zeus and Leda. Helengrad The government of New Zealand Prime Minister Helen Clark, or her seat of power in the capital Wellington. helenin A stearoptene from Inula helenium used as an internal and external antiseptic. helenite A greenish artificial gem, made by melting and vitrifying volcanic ash from the 1980 eruption of Mount Saint Helens. helenium Any of various flowering plants, of the genus Helenium, the dried leaves of which were once used to make a form of snuff. Helensburgh A town in Argyll and Bute council area, Scotland (OS grid ref NS2982). Helensville A town north-west of Auckland, New Zealand. Helentjaris A surname. Helenus the son of King Priam and Queen Hecuba of Troy, the twin brother of the prophetess Cassandra. heleomyzid Any member of the family Heleomyzidae of flies. heleophrynid Any ghost frog in the family Heleophrynidae. heleoplankton Plankton that lives in still freshwater such as ponds and marshes. helepolis an ancient Greek siege engine consisting of a wheeled tower containing machines for throwing stones and spears Heley A surname. Helf A surname from German. Helfand A surname from Yiddish. helfie A self-taken photograph of one's hair. Helford A coastal village in Manaccan parish, south of the Helford River in Cornwall, England (OS grid ref SW7526). Helfrich A surname. Helft A surname. Helga A female given name from Old Norse occasionally borrowed from Scandinavia. Helgeland A district of Nordland, Norway. Helgerson A surname. Helgesen A surname from Norwegian. Helgeson A surname. Helget A surname from German. Helheim The realm of the dead, (also known as Hel), the domain of the goddess Hel. Located beyond Niflheim, (one of the Nine Realms). Helhest A three-legged supernatural horse associated with death or Hel in Danish folklore. heliac A stellarator in which the magnetic axis (and plasma) follows a helical path to form a toroidal helix rather than a simple ring shape. heliacal Of or relating to the Sun, especially rising and setting with the sun. heliacally In a heliacal manner; with the rising or setting sun. Heliades The daughters of Helios and Clymene. heliair A mixture of helium, nitrogen and oxygen, used as a breathing gas instead of normal air. heliangolide Any of a subgroup of germacranolides associated with the plant genus Helianthus. helianthaceous Of or relating to the Helianthaceae. helianthamide A peptide, found in the sea anemone Stichodactyla helianthus, that inhibits amylase. helianthemum Any member of the species in the genus Helianthemum of rockroses. helianthin methyl orange helianthoid Of or pertaining to the Helianthoidea, an obsolete subdivision of zoophytes, certain sea anemones and similar species helianthophobia The fear of sunflowers (plant). helianthoside A particular steroid glycoside. helianthus Any plant, of the genus Helianthus, having large flower heads with dark disk florets and showy yellow rays; the sunflowers heliast A judge in the supreme court of ancient Athens. heliastic Of or relating to heliasts. helibase A base location from which helicopter missions are flown, offering servicing and refuelling facilities. helibiking The sport of mountain biking from a dropoff point reached by helicopter heliboarding The extreme sport of snowboarding after jumping out of a helicopter. heliborne Transported by helicopter. helibucket Synonym of helicopter bucket. helibus A large, passenger-carrying helicopter. helicab A helicopter used as a taxicab. helical In the shape of a helix. helicality The condition of being helical helically In a helical manner, spirally. helicam A helicopter-mounted video camera helicarionid Any snail of the family Helicarionidae. helicase An enzyme required for DNA unwinding. helicate Any of various polymeric compounds that have a helical structure Helice A town of Achaia situated on the coast between the rivers Selinus and Cerynites helicene Any polycyclic aromatic or heteroaromatic compound, consisting of at least five ortho-fused rings arranged to give a helically-shaped chiral molecule. helichopper helicopter helichryse An unidentified plant with yellow flowers, anciently used in garlands. helichrysin A yellow pigment in several species of Helichrysum. helichrysum Any of the genus Helichrysum of plants related to the sunflower. helicicultural Relating to heliciculture heliciculture snail farming helicid Any snail of the family Helicidae. helicidine An antitussive consisting of an extract from the mucus of the snail Helix pomatia heliciform Having the form of a helix; spiral; helical. heliciid Any plant of the subtribe Heliciinae helicin A glucoside obtained by partial oxidation of salicin from willows of species Salix purpurea (syn. Salix helix). It is a O-glucoside of salicylaldehyde helicine Of, related to, or being a helix. helicinid Any snails in the family Helicinidae. helicitic Pertaining to a texture in metamorphic rocks where minerals contain contorted microscopic inclusions that represent the original bedding or alignment of the parent rock. helicity The quality of being helical. helicline A curving or spiral-shaped ramp; (especially) the ramp at the 1939 New York World's Fair Theme Center. helicobacter Any member of the Helicobacter bacteria. helicobacteremia The presence of helicobacters in the blood helicobactericidal That kills helicobacters helicobacteriosis infection with helicobacters helicocone A conelike spiral tube that is the form of most mollusc shells. helicodiscid Any snail in the family Helicodiscidae. helicogenic That makes polypeptides and proteins acquire a helical form helicograph An instrument for drawing spiral lines on a plane. helicoid Having the form of a flattened helix. helicoidal Synonym of helicoid. helicoidally In the form of a helicoid helicoidization Modification to a helicoid form helicoidly In a helicoid manner. helicon A large tuba whose coils fit around the player's shoulders. heliconia Any of the genus Heliconia of flowering plants. heliconiaceous Of or relating to the Heliconiaceae. heliconian Of or pertaining to Helicon. heliconical Relating to a helicon heliconiid Any butterfly in the nymphalid subfamily Heliconiinae, formerly the family Heliconiidae. heliconiine Of or relating to the Heliconian butterflies. heliconist Someone who plays a helicon. helicophagous that feeds on snails helicophagy feeding on snails helicoplacoid Any extinct echinoderm of the class Helicoplacoidea helicopsychid Any caddis fly in the family Helicopsychidae. helicopt To helicopter. helicopter An aircraft that is borne along by one or more sets of long rotating blades which allow it to hover, move in any direction including reverse, or land; and typically having a smaller set of blades on its tail to stabilize the aircraft. helicopterful Enough to fill a helicopter. helicoptering transport by helicopter helicopterlike Resembling or characteristic of a helicopter. helicopteron A flying machine having an aerial screw propeller. helicoptery Like a helicopter parent; paying inordinate amounts of attention to one's children. helicorubin A red heme pigment in the gut of certain molluscs. helicospiral A spiral in the shape of a cone.