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There are 6 nine-letter words beginning with PTER

PTERIDINE• pteridine n. (Organic chemistry) A bicyclic aromatic heterocycle consisting of fused pyrimidine and pyrazine rings.
• PTERIDINE n. any member of a genus of ferns that includes bracken.
PTEROPODS• pteropods n. Plural of pteropod.
• PTEROPOD n. a small swimming mollusc, often shell-less.
PTEROSAUR• pterosaur n. Any of several flying reptiles, of the extinct order Pterosauria, including the pterodactyls.
• PTEROSAUR n. a pterodactyl, also PTEROSAURIAN.
PTERYGIAL• pterygial adj. (Anatomy) Of or pertaining to the pterygium.
• PTERYGIAL adj. of or relating to a wing or fin.
• PTERYGIAL n. a bone in a fin.
PTERYGIUM• pterygium n. (Pathology) An abnormal mass of tissue in the corner of the eye that obstructs vision.
• pterygium n. (Zoology) A generalized limb of a vertebrate.
• PTERYGIUM n. a growth over the cornea.
PTERYGOID• pterygoid adj. (Anatomy) Of, pertaining to or lying in the region of the inferior part of the sphenoid bone of the vertebrate skull.
• pterygoid n. (Anatomy) A pterygoid part (such as a bone, muscle, or nerve).
• PTERYGOID adj. winglike.

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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