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There are 8 twelve-letter words containing PTERI

AMINOPTERINS• aminopterins n. Plural of aminopterin.
• AMINOPTERIN n. a rodenticide.
COLEOPTERIST• coleopterist n. (Entomology) One who studies beetles.
• COLEOPTERIST n. one who studies beetles.
NEUROPTERIST• neuropterist n. An entomologist whose speciality is lacewings of the order Neuroptera.
• NEUROPTERIST n. a person who studies the Neuropteroidea, lacewing flies.
ORTHOPTERIST• orthopterist n. An entomologist who specialises in orthopters.
• ORTHOPTERIST n. a student of insects.
PTERIDOMANIA• pteridomania 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.
PTERIDOPHYTE• pteridophyte 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.
PTERIDOSPERM• pteridosperm 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.
XANTHOPTERIN• xanthopterin 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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