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 List of 13-letter words containing ••••••Click to add an eighth letter
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 There are 3 thirteen-letter words containing N, 2O, P, Q, S and U| PLASTOQUINONE | • plastoquinone n. (Biochemistry) a quinone, related to the carotenoids, involved in the electron transport process of photosynthesis. • PLASTOQUINONE n. a plant substance that is related to vitamin K and plays a role in photosynthetic phosphorylation. |  | QUADROPHONICS | • QUADROPHONICS n. a system of sound transmission using a minimum of four speakers, also QUADRAPHONICS, QUADRAPHONY, QUADRIPHONICS, QUADROPHONY. |  | QUADROPHONIES | • QUADROPHONY n. a system of sound transmission using four speakers, also QUADRAPHONICS, QUADRAPHONY, QUADRIPHONICS, QUADROPHONICS. |  
 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: 13 words
 - Scrabble in French: 36 words
 - Scrabble in Spanish: 8 words
 - Scrabble in Italian: 4 words
 - Scrabble in German: no word
 - Scrabble in Romanian: no word
 
 
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