毛圆线虫总科：圆线总科中的线虫，包括毛圆线虫(Trichostrongylus)，血矛线虫(Haemonchus)、日原线虫(Nippostrongylus)和细颈线虫(Nematodirus)等属- pyrophosphoric acid
- pyrophosphotransferase
- Pyroplasma
- pyropuncture
- pyroscope
- pyrosis
- Pyrosoma
- pyrotic
- pyrotoxin
- pyrovalerone hydrochloride
- pyroxamine maleate
- pyroxylin
- pyrrobutamine phosphate
- pyrrocaine
- pyrroetioporphyrin
- pyrrole
- pyrrolidine
- pyrroline
- pyrroline-5-carboxylate reductase
- pyrrolnitrin
- pyrroloporphyria
- pyrroporphyrin
- pyruvate
- pyruvate carboxylase
- pyruvate carboxylase (PC) deficiency