path·o·gen 
(păthə-jən)
(păthə-jən)n.
An agent that causes disease, especially a virus, bacterium, or fungus.
- semifluid
- semifluidity
- semiformal
- semifreddo
- semigloss
- semiglossy
- semigroup
- semihard
- semiheavy water
- semi-independent
- semi-infinite
- semiliquid
- semiliquidity
- semiliteracy
- semiliterate
- Semillon
- semilog
- semilogarithmic
- semilunar
- semilunar bone
- semilunar cartilage
- semilunar valve
- semilunate
- semimembranous
- semimonthly