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There are 11 twelve-letter words containing A, C, D, H, I, N, O and Y

CHIMNEYBOARDCHIMNEYBOARD n. a board blocking up a fireplace.
CONCHOIDALLYconchoidally adv. In a conchoidal manner.
CONCHOIDAL adv. shell-like, as applied to fractures in glass and quartz.
CYANOHYDRINScyanohydrins n. Plural of cyanohydrin.
CYANOHYDRIN n. any of various compounds containing both cyano and hydroxyl groups.
HAEMODYNAMIChaemodynamic adj. (British spelling) Alternative spelling of hemodynamic.
HAEMODYNAMIC adj. of or relating to blood circulation, also HEMODYNAMIC.
HEMODYNAMICShemodynamics n. (Medicine) The circulation and movement of blood in the body, and the forces involved therein.
HEMODYNAMICS n. a branch of physiology that deals with the circulation of the blood, also HAEMODYNAMICS.
HYDRODYNAMIChydrodynamic adj. (Physics) Of, or relating to the science of hydrodynamics.
hydrodynamic adj. Operated by the force of water in motion.
HYDRODYNAMIC adj. of, relating to, or involving principles of hydrodynamics, also HYDRODYNAMICAL.
HYDROMANCIEShydromancies n. Plural of hydromancy.
HYDROMANCY n. divination by the appearance or motion of liquids (as water).
HYDRONICALLYhydronically adv. In terms of, or by means of, hydronics.
HYDRONIC adv. pertaining to heating and cooling by water.
HYPOCHONDRIAhypochondria n. (Medicine) A psychological disorder characterized by excessive preoccupation or worry about having a serious illness.
hypochondria n. (Obsolete, medicine) Melancholy; depression.
hypochondria n. Plural of hypochondrium.
HYRACOIDEANSHYRACOIDEAN n. any member of a genus of mammals including the daman and the dassie or hyrax, also HYRACOID.
PHOTODYNAMICphotodynamic adj. Of, relating to, or caused by the energy or momentum of light or other electromagnetic radiations.
photodynamic adj. Of, or relating to photodynamics.
PHOTODYNAMIC adj. of, relating to, or having the property of intensifying or inducing a toxic reaction to light (as in the destruction of cancer cells stained with a light-sensitive dye) in a living system.

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: 74 words
  • Scrabble in French: 1 word
  • Scrabble in Spanish: no word
  • Scrabble in Italian: no word
  • Scrabble in German: no word
  • Scrabble in Romanian: no word


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