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There are 8 twelve-letter words containing H, M, N, U and X

HYDROXONIUMShydroxoniums n. Plural of hydroxonium.
HYDROXONIUM n. the obsolete name for the cation H3O+ derived from protonation of water.
PNEUMOTHORAXpneumothorax n. (Medicine) Presence of air inside the pleural cavity, usually caused by injury either to the lung or the chest wall.
PNEUMOTHORAX n. accumulation of air or gas in the pleural cavity.
UNNILHEXIUMSUNNILHEXIUM n. a chemical element, aka seaborgium.
XANTHOMATOUSxanthomatous adj. Of or relating to xanthoma or xanthomatosis.
XANTHOMATOUS adj. of or like a xanthoma, a skin disease marked by the development or irregular yellowish patches upon the skin.
XENODOCHIUMSxenodochiums n. Plural of xenodochium.
XENODOCHIUM n. a building for the reception of strangers, e.g. a guesthouse in a monastery.
XERANTHEMUMSxeranthemums n. Plural of xeranthemum.
XERANTHEMUM n. any plant of the Xeranthemum genus of plants of southern Europe, belonging to the thistle family.
XIPHISTERNUMxiphisternum n. (Biology, medicine) Synonym of xiphoid process.
XIPHISTERNUM n. the posterior and smallest of the three divisions of the sternum.
ZANTHOXYLUMSzanthoxylums n. Plural of zanthoxylum.
ZANTHOXYLUM n. a plant of a genus of the rue family found in Brazil, in particular the prickly-ash or Hercules club, also XANTHOXYL, ZANTHOXYL.

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 1Word.ws and WikWik.org.

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See this list for:

  • English Wiktionary: 24 words
  • Scrabble in French: 8 words
  • Scrabble in Spanish: 1 word
  • Scrabble in Italian: no word
  • Scrabble in German: no word
  • Scrabble in Romanian: no word


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