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 There are 9 eleven-letter words containing IPER| CALLIPERING | • callipering v. Present participle of calliper. • CALLIPER v. to measure with callipers. |  | PIPERACEOUS | • piperaceous adj. (Botany) Of or pertaining to the order of plants, Piperaceae, of which the pepper is the type. • PIPERACEOUS adj. pertaining to or like pepper plant; belonging to pepper family of plants. |  | PIPERAZINES | • piperazines n. Plural of piperazine. • PIPERAZINE n. a crystalline nitrogen compound used in medicine, insecticides etc. |  | PIPERIDINES | • piperidines n. Plural of piperidine. • PIPERIDINE n. an oily liquid alkaloid having a hot, peppery, ammoniacal odor. |  | SIDESWIPERS | • sideswipers n. Plural of sideswiper. • SIDESWIPER n. one who sideswipes. |  | SNIPERSCOPE | • sniperscope n. (Military) A night vision device used to assist snipers in locating their targets in the dark. • SNIPERSCOPE n. an optical device for use esp. with a rifle that allows a person to see targets better in the dark. |  | TRIPERSONAL | • tripersonal adj. Consisting of three persons. • TRIPERSONAL adj. consisting of three persons. |  | UNIPERSONAL | • unipersonal adj. Comprising a single person. • unipersonal adj. (Grammar) Synonym of impersonal. • UNIPERSONAL adj. existing as only one person. |  | VIPERFISHES | • viperfishes n. Plural of viperfish. • VIPERFISH n. a predatory deep-sea fish. |  
 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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