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 There are 7 twelve-letter words containing A, H, I, O, U and X| AUXOTROPHIES | • auxotrophies n. Plural of auxotrophy. • AUXOTROPHY n. the state of being auxotrophic, requiring a specific growth substance beyond the minimum required for normal metabolism.
 |  | FUCOXANTHINS | • fucoxanthins n. Plural of fucoxanthin. • FUCOXANTHIN n. a brown carotenoid pigment occurring esp. in the chloroplasts of brown algae.
 |  | HETEROAUXINS | • heteroauxins n. Plural of heteroauxin. • HETEROAUXIN n. a natural plant hormone, used esp. for stimulating growth and root formation in plant cutting.
 |  | HEXAFLUORIDE | • hexafluoride n. (Chemistry) any fluoride containing six fluorine atoms in each molecule. • HEXAFLUORIDE n. a chemical compound with the general formula XF6.
 |  | PYRRHULOXIAS | • pyrrhuloxias n. Plural of pyrrhuloxia. • PYRRHULOXIA n. a grey-and-pink crested bunting of Central and SW North America, with a short parrot-like bill.
 |  | SULPHADOXINE | • sulphadoxine n. Alternative spelling of sulfadoxine. • SULPHADOXINE n. an antibiotic drug of the sulphonamide group, commonly used in combination with pyrimethamine to treat malaria, also SULFADOXINE.
 |  | XIPHOPAGUSES | • XIPHOPAGUS n. a set of Siamese twins joined in the region of the xiphoid cartilage. | 
 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.
 
 See this list for:English Wiktionary: 26 wordsScrabble in French: 7 wordsScrabble in Spanish: 2 wordsScrabble in Italian: no wordScrabble in German: no wordScrabble in Romanian: 9 words
 
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