id·i·op·a·thy 
(ĭd′ē-ŏpə-thē)
(ĭd′ē-ŏpə-thē)n.
1. A disease of unknown origin or cause.
2. A primary disease arising spontaneously with no apparent external cause.
[New Latin idiopathīa, primary disease, from Greek idiopatheia : idio-, idio- + -patheia, -pathy.]
- permanent press
- permanent-press
- permanent tooth
- permanganate
- permanganic acid
- permatemp
- permeability
- permeable
- permeably
- permeance
- permeant
- permease
- permeate
- permeation
- permeative
- permethrin
- Permian
- per mil
- per mill
- permineralization
- permineralize
- permissibility
- permissible
- permissibleness
- permissibly