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There are 8 twelve-letter words containing PTERI

AMINOPTERINSaminopterins n. Plural of aminopterin.
AMINOPTERIN n. a rodenticide.
COLEOPTERISTcoleopterist n. (Entomology) One who studies beetles.
COLEOPTERIST n. one who studies beetles.
NEUROPTERISTneuropterist n. An entomologist whose speciality is lacewings of the order Neuroptera.
NEUROPTERIST n. a person who studies the Neuropteroidea, lacewing flies.
ORTHOPTERISTorthopterist n. An entomologist who specialises in orthopters.
ORTHOPTERIST n. a student of insects.
PTERIDOMANIApteridomania n. A craze, in 19th-century England, for collecting ferns and for using images of ferns in the decorative arts.
PTERIDOMANIA n. a passion for ferns.
PTERIDOPHYTEpteridophyte n. Any plant of the division Pteridophyta, of simple vascular plants that reproduce via spores rather than…
PTERIDOPHYTE n. the general name for the ferns and their allies.
PTERIDOSPERMpteridosperm n. Any of various extinct gymnosperms, of the division Pteridospermatophyta, resembling ferns, but producing…
PTERIDOSPERM n. an extinct group of seed plants which bore fernlike leaves.
XANTHOPTERINxanthopterin n. A yellow crystalline solid that occurs mainly in the wings of butterflies and in the urine of mammals…
XANTHOPTERIN n. a yellow pigment obtainable from the wings of yellow butterflies and the urine of mammals, also XANTHOPTERINE.

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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