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 There are 5 thirteen-letter words containing H, I, O, R, 2S, U and Y| HALFSERIOUSLY | • HALFSERIOUSLY adv. in a partially joking way. |  | ICHTHYOSAURUS | • ichthyosaurus n. (Archaic) Alternative form of ichthyosaur. • ichthyosaurus n. Any members of the genus Ichthyosaurus.
 • Ichthyosaurus prop.n. A taxonomic genus within the family Ichthyosauridae – large, extinct marine reptiles.
 |  | ISOCHRONOUSLY | • isochronously adv. In an isochronous manner. • ISOCHRONOUS adv. having the same duration; recurring at equal intervals.
 |  | NEUROSYPHILIS | • neurosyphilis n. (Pathology) A syphilis infection affecting the nervous system. • NEUROSYPHILIS n. a syphilitic infection affecting the central nervous system.
 |  | SURVEYORSHIPS | • surveyorships n. Plural of surveyorship. • SURVEYORSHIP n. the office of surveyor.
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 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.
 
 See this list for:English Wiktionary: 28 wordsScrabble in French: 8 wordsScrabble in Spanish: no wordScrabble in Italian: no wordScrabble in German: no wordScrabble in Romanian: no word
 
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