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 There are 7 thirteen-letter words containing D, H, I, O and Q| HYDROQUINONES | • hydroquinones n. Plural of hydroquinone. • HYDROQUINONE n. another name for quinol.
 |  | QUADRAPHONICS | • quadraphonics n. Quadraphonic sound. • QUADRAPHONICS n. a system of sound transmission using a minimum of four speakers, also QUADRAPHONY, QUADRIPHONICS, QUADROPHONICS, QUADROPHONY.
 |  | QUADRAPHONIES | • QUADRAPHONY n. a system of sound transmission using four speakers, also QUADRAPHONICS, QUADRIPHONICS, QUADROPHONICS, QUADROPHONY. |  | QUADRILLIONTH | • quadrillionth adj. The ordinal form of the number one quadrillion. • quadrillionth n. The person or thing in the quadrillionth position.
 • quadrillionth n. One of a quadrillion equal parts of a whole.
 |  | QUADRIPHONICS | • quadriphonics n. Alternative form of quadraphonics. • QUADRIPHONICS n. a system of sound transmission using a minimum of four speakers, also QUADRAPHONICS, QUADRAPHONY, QUADROPHONICS, QUADROPHONY.
 |  | 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 WikWik.org and 1Word.ws.
 
 See this list for:English Wiktionary: 13 wordsScrabble in French: 41 wordsScrabble in Spanish: 14 wordsScrabble in Italian: 2 wordsScrabble in German: no wordScrabble in Romanian: no word
 
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