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There are 16 twelve-letter words containing A, D, E, H, I, R, T and Y

AFFRIGHTEDLYaffrightedly adv. (Archaic, poetic) with fright.
AFFRIGHTED adv. AFFRIGHT, to frighten.
ANTIHYDROGENantihydrogen n. (Physics, uncountable) The antimatter equivalent of hydrogen, consisting of an antiproton and an positron…
antihydrogen n. (Physics, countable) An atom of the antimatter equivalent of hydrogen.
ANTIHYDROGEN n. an antimatter form of hydrogen.
BIGHEARTEDLYbigheartedly adv. In a bighearted manner.
big-heartedly adv. Alternative form of bigheartedly.
BIGHEARTED adv. generous, charitable.
DEHYDRATIONSdehydrations n. Plural of dehydration.
DEHYDRATION n. loss or withdrawal of moisture.
DIATHERMANCYdiathermancy n. The condition of being diathermic.
DIATHERMANCY n. permeability by or conductibility of radiant heat, also DIATHERMACY.
FARSIGHTEDLYfarsightedly adv. In a farsighted manner.
FARSIGHTED adv. seeing or able to see to a great distance.
HEMIHYDRATEDhemihydrated adj. (Chemistry) In the form of a hemihydrate.
HEMIHYDRATED adj. in the form of a hemihydrate.
HEMIHYDRATEShemihydrates n. Plural of hemihydrate.
HEMIHYDRATE n. a hydrate, such as plaster of paris, containing half a mole of water to one mole of the compound forming the hydrate.
HEREDITARILYhereditarily adv. In a hereditary manner.
hereditarily adv. With regard to inheritance.
HEREDITARY adv. genetically transmitted or transmittable from parent to offspring.
HYDRASTININEhydrastinine n. (Organic chemistry) A semisynthetic alkaloid resulting from the hydrolysis of hydrastine.
HYDRASTININE n. a colourless crystalline water-soluble compound whose pharmacological action resembles that of hydrastine.
HYDROELASTIChydroelastic adj. (Physics) undergoing elastic deformation as the result of the flow of a fluid, especially that of water.
HYDROELASTIC adj. as in hydroelastic suspension, a system of car suspension in which a fluid provides interconnection between the front and rear suspension units.
HYDROPATHIEShydropathies n. Plural of hydropathy.
HYDROPATHY n. the study of treating diseases with water.
HYPERACIDITYhyperacidity n. The condition of being excessively acidic.
HYPERACIDITY n. the condition of containing more than the normal amount of acid.
PYRITOHEDRALpyritohedral adj. Having the shape of pyrites.
pyritohedral adj. (Mathematics) Having the shape of a pyritohedron.
PYRITOHEDRAL adj. of or like a pyritohedron, a pentagonal dodecahedron.
RADIOTHERAPYradiotherapy n. The therapeutic use of ionizing radiation, almost exclusively used for the treatment of malignant disease.
RADIOTHERAPY n. treatment by radiation.
REHYDRATIONSrehydrations n. Plural of rehydration.
REHYDRATION n. the act of rehydrating.

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: 98 words
  • Scrabble in French: 21 words
  • Scrabble in Spanish: no word
  • Scrabble in Italian: no word
  • Scrabble in German: no word
  • Scrabble in Romanian: no word


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