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There are 9 thirteen-letter words beginning with PTER

PTERIDOLOGIESPTERIDOLOGY n. the study of ferns.
PTERIDOLOGISTpteridologist n. A person who studies ferns and other pteridophytes.
PTERIDOLOGIST n. one who studies pteridology.
PTERIDOMANIASPTERIDOMANIA n. a passion for ferns.
PTERIDOPHYTESpteridophytes n. Plural of pteridophyte.
PTERIDOPHYTE n. the general name for the ferns and their allies.
PTERIDOPHYTICpteridophytic adj. Of or pertaining to the ferns of the division Pteridophyta.
PTERIDOPHYTIC adj. of or like a pteridophyte, a fern, also PTERIDOPHYTOUS.
PTERIDOSPERMSpteridosperms n. Plural of pteridosperm.
PTERIDOSPERM n. an extinct group of seed plants which bore fernlike leaves.
PTERODACTYLESPTERODACTYLE n. any of various pterosaurs of the Late Jurassic and Cretaceous having a rudimentary tail and a beak with reduced dentition, also PTERODACTYL.
PTEROSAURIANSpterosaurians n. Plural of pterosaurian.
PTEROSAURIAN n. a pterodactyl, also PTEROSAUR.
PTERYLOGRAPHYpterylography n. (Zoology) The study or description of the arrangement of feathers, or of the pterylae, of birds.
PTERYLOGRAPHY n. a description of pterylae.

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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