PNEUMONIC is a 9 letter word that starts with P.

1. \Pneu*mon"ic\, a. [Gr. ?: cf. F. pneumonique.]
   (a) Of or pertaining to the lungs; pulmonic.
   (b) Of or pertaining to pneumonia; as, pneumonic symptoms.
   
   

2. \Pneu*mon"ic\, n. (Med.)
   A medicine for affections of the lungs.