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 There are 3 twelve-letter words containing IPER| ANTIPERIODIC | • antiperiodic adj. (Medicine) preventing the regular recurrence of symptoms. • antiperiodic adj. (Mathematics) Exhibiting antiperiodicity. • antiperiodic n. (Medicine) A drug that prevents the regular recurrence of symptoms. |  | LIGNIPERDOUS | • ligniperdous adj. (Zoology) Wood-destroying; said of certain insects and fungi. • LIGNIPERDOUS adj. destroying wood. |  | SNIPERSCOPES | • sniperscopes n. Plural of sniperscope. • SNIPERSCOPE n. an optical device for use esp. with a rifle that allows a person to see targets better in the dark. |  
 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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