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There are 12 eight-letter words beginning with HYDRO

HYDROGELhydrogel n. A colloid gel in which water is the continuous phase; they have a number of medical and industrial applications.
HYDROGEL n. a gel or gelatinous precipitate in which the liquid constituent is water.
HYDROGENhydrogen n. The lightest chemical element (symbol H), with an atomic number of 1 and atomic weight of 1.00794.
hydrogen n. Molecular hydrogen (H2), a colourless, odourless and flammable gas at room temperature.
hydrogen n. A sample of the element/molecule.
HYDROIDShydroids n. Plural of hydroid.
HYDROID n. a marine creature related to, or resembling, the hydra.
HYDROMASHYDROMA n. a watery swelling over a joint, e.g. water on the knee, also HYGROMA.
HYDROMELhydromel n. A liquor consisting of honey diluted in water; mead prior to fermentation.
HYDROMEL n. a drink made with honey, water, herbs and spices.
HYDRONIChydronic adj. Being or relating to a heating system that involves circulating hot water or steam.
HYDRONIC adj. pertaining to heating and cooling by water.
HYDROPIChydropic adj. Dropsical; pertaining to or suffering from dropsy (edema).
hydropic adj. (Obsolete) Insatiably thirsty (like someone with dropsy).
hydropic adj. Swollen with water; characterized by swelling and accumulation of fluid.
HYDROPSYhydropsy n. (Dated) Edema, dropsy.
HYDROPSY n. (archaic) dropsy, also HYDROPS.
HYDROSKIhydroski n. A ski allowing a seaplane to land on water.
HYDROSKI n. a plate attached to a seaplane to facilitate takeoff and landings.
HYDROSOLhydrosol n. A sol (colloid) in which the continuous phase (dispersing medium) is water.
HYDROSOL n. an aqueous solution of a colloid.
HYDROXYLhydroxyl n. (Chemistry) A univalent radical or functional group (–OH) in organic chemistry; present in alcohols…
HYDROXYL n. the group containing oxygen and hydrogen.
HYDROZOAhydrozoa n. A large group of marine animals, of the class Hydrozoa, whose life cycles contain a sexual and asexual stage.
Hydrozoa prop.n. A taxonomic class within the phylum Cnidaria – hydrozoas.
HYDROZOON n. any coelenterate of the class Hydrozoa, comprising organisms that are mostly marine and colonial with polyp and medusoid stages in the life cycle, also HYDROZOAN.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the WikWik.org and 1Word.ws.

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See this list for:

  • English Wiktionary: 20 words
  • Scrabble in French: 5 words
  • Scrabble in Spanish: no word
  • Scrabble in Italian: 1 word
  • Scrabble in German: 3 words
  • Scrabble in Romanian: no word


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