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 There are 3 thirteen-letter words containing D, I, L, Q, 2R and U| QUADRILATERAL | • quadrilateral n. A polygon with four sides. • quadrilateral n. An area defended by four fortresses supporting each other. • quadrilateral adj. Having four sides. |  | QUADRILITERAL | • quadriliteral adj. Used to describe word roots in Afroasiatic languages which consist of four letters. • quadriliteral n. A word root in an Afroasiatic language which consists of four letters. • QUADRILITERAL adj. consisting of four letters. |  | QUADRILOCULAR | • quadrilocular adj. Having four cells or compartments. • QUADRILOCULAR adj. having four compartments. |  
 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. 
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