- palfreyA small horse with a smooth, ambling gait, popular in the Middle Ages with nobles and women for riding (contrasted with a warhorse).
- parabariomicroliteA trigonal-hexagonal scalenohedral mineral containing barium, hydrogen, oxygen, and tantalum.
- parablepsisA circumstance in which a scribe miscopies text due to inadvertently looking to the side while copying, or accidentally skips over some of it.
- paraphragmaparaphragm.
- paraprosdokianA figure of speech in which the latter part of a sentence or phrase is surprising or unexpected in a way that causes the reader or listener to reframe or reinterpret the first part.
- paraseleneSynonym of moon dog.
- parastichyA secondary spiral of leaves or florets.
- parophthalmoncusA tumor or swelling near the eye.