What are some nine letter words with 1st letter P and 2nd letter T and 4th letter R and 7th letter I?

According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 3 words with the pattern PT-R--I--. That is, nine letter words with 1st letter P and 2nd letter T and 4th letter R and 7th letter I. In alphabetical order, they are:

pteridine

pterygial

pterygium