小杆线虫属：小杆总科(Rhabditis)的一属微小线虫，大都生活在湿泥中，偶寄生于人体；人体小杆线虫(R. hominis)和肠小杆线虫(R. intestinalis)已在粪便中检出，R. niellyi见于皮肤中，鼠小杆线虫(R. pellio)有时可在尿殖器中检出- pyrolusite
- pyrolysis
- pyromania
- pyrometer
- pyrone
- Pyronil
- pyronine
- pyroninophilia
- pyronyxis
- pyrophobia
- pyrophosphatase
- pyrophosphate
- pyrophosphokinase
- pyrophosphoric acid
- pyrophosphotransferase
- Pyroplasma
- pyropuncture
- pyroscope
- pyrosis
- Pyrosoma
- pyrotic
- pyrotoxin
- pyrovalerone hydrochloride
- pyroxamine maleate
- pyroxylin