thorn·back 
(thôrnbăk′)
(thôrnbăk′)n.
Any of various rays having spines on the back, especially Raja clavata, found in coastal waters of the eastern Atlantic Ocean and the Mediterranean Sea.
- personator
- personhood
- personification
- personifier
- personify
- personnel
- person of color
- person of interest
- person-to-person
- perspectival
- perspective
- perspectively
- perspicacious
- perspicaciously
- perspicaciousness
- perspicacity
- perspicuity
- perspicuous
- perspicuously
- perspicuousness
- perspiration
- perspiratory
- perspire
- persuadable
- persuade