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 List of 13-letter words containing •••••Click to add a seventh letter
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 There are 4 thirteen-letter words containing I, 2O, P, Q and U| PHYLLOQUINONE | • phylloquinone n. (Biochemistry, pharmacology) Synonym of phytomenadione. • PHYLLOQUINONE n. vitamin K1, one of the fat-soluble vitamin K group, essential for normal blood coagulation. |  | 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. 
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