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 List of 13-letter words containing ••••••Click to add an eighth letter
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 There are 14 thirteen-letter words containing A, I, O, 2S, U and Y| ANISOPHYLLOUS | • anisophyllous adj. (Botany) Having unequal leaves. • ANISOPHYLLOUS adj. of leaves, usually a pair, of differing size and shape. |  | AUTOCATALYSIS | • autocatalysis n. (Chemistry) catalysis of a reaction by one of its products. • AUTOCATALYSIS n. the catalysis of a reaction by a product of that reaction. |  | ERYSIPELATOUS | • erysipelatous adj. Resembling erysipelas. • ERYSIPELATOUS adj. suffering from the skin disease erysipelas. |  | FISSIPAROUSLY | • fissiparously adv. In a fissiparous manner. • FISSIPAROUS adv. producing new biological units or individuals by fission, as with most strains of bacteria. |  | 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. |  | PNEUMATOLYSIS | • pneumatolysis n. (Geology) the alteration of rocks and minerals by gases or magmatic fluid within volcanos etc. • PNEUMATOLYSIS n. the destructive action of the hot vapours of magma on igneous rock. |  | PRASEODYMIUMS | • praseodymiums n. Plural of praseodymium. • PRASEODYMIUM n. a chemical element, a metal with green salts, isolated from the once-supposed element didymium. |  | PRESBYACOUSIS | • PRESBYACOUSIS n. progressive loss of hearing with advancing old age, also PRESBYACUSIS, PRESBYCOUSIS, PRESBYCUSIS. |  | PROGYMNASIUMS | • PROGYMNASIUM n. in Germany, a gymnasium for pupils up to age 16 only, at which university entrance qualifications are not obtainable. |  | SUBVERSIONARY | • subversionary adj. Promoting destruction. • SUBVERSIONARY n. a subversive person. |  | SUPERLOYALIST | • superloyalist n. A very committed loyalist. • SUPERLOYALIST n. an extreme loyalist. |  | VOLUNTARYISMS | • voluntaryisms n. Plural of voluntaryism. • VOLUNTARYISM n. the principle or practice of reliance on voluntary action, not coercion. |  | VOLUNTARYISTS | • voluntaryists n. Plural of voluntaryist. • VOLUNTARYIST n. a believer in voluntaryism. |  
 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: 91 words
 - Scrabble in French: 49 words
 - Scrabble in Spanish: 26 words
 - Scrabble in Italian: no word
 - Scrabble in German: no word
 - Scrabble in Romanian: no word
 
 
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