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 There are 15 thirteen-letter words containing A, H, I, O, 2R, S and U| ARCHOSAURIANS | • archosaurians n. Plural of archosaurian. • ARCHOSAURIAN n. any of a subclass of reptiles comprising pterosaurs, dinosaurs and crocodilians, also ARCHOSAUR.
 |  | BRACHIOSAURUS | • brachiosaurus n. A large herbivorous sauropod dinosaur, Brachiosaurus altithorax, which lived during the Jurassic period. • Brachiosaurus prop.n. A taxonomic genus within the family Brachiosauridae – brachiosauruses.
 • BRACHIOSAURUS n. any member of a genus of huge lizard-hipped plant-eating dinosaurs.
 |  | CHIAROSCURISM | • CHIAROSCURISM n. the practice of chiaroscuro. |  | CHIAROSCURIST | • chiaroscurist n. A painter who uses light and shade rather than colour to create the illusion of volume. • CHIAROSCURIST n. an artist who specializes in chiaroscuro.
 |  | GROUNDSHARING | • groundsharing v. Present participle of groundshare. • GROUNDSHARE v. to share a sports stadium with another team.
 |  | HELIOGRAVURES | • heliogravures n. Plural of heliogravure. • HELIOGRAVURE n. photogravure.
 |  | PREAUTHORIZES | • preauthorizes v. Third-person singular simple present indicative form of preauthorize. |  | RADIOTHORIUMS | • RADIOTHORIUM n. a radioactive isotope of thorium with the mass number 228. |  | REAUTHORISING | • REAUTHORISE v. to authorise again, also REAUTHORIZE. |  | RHABDOVIRUSES | • rhabdoviruses n. Plural of rhabdovirus. • RHABDOVIRUS n. a class of virus that includes rabies.
 |  | SCROPHULARIAS | • SCROPHULARIA n. a plant of the figwort genus. |  | SUBARRHATIONS | • SUBARRHATION n. an ancient form of betrothal in which pledges of money, rings, etc. were given by the man to the woman, also SUBARRATION. |  | SURROGATESHIP | • surrogateship n. The position or office of a surrogate. • SURROGATESHIP n. the office of surrogate.
 |  | URANOGRAPHIES | • uranographies n. Plural of uranography. • URANOGRAPHY n. descriptive astronomy and mapping.
 |  | URANOGRAPHIST | • URANOGRAPHIST n. one who practises uranography, descriptive astronomy and mapping. | 
 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: 82 wordsScrabble in French: 36 wordsScrabble in Spanish: 37 wordsScrabble in Italian: 30 wordsScrabble in German: no wordScrabble in Romanian: 33 words
 
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