hard·en·er 
(härdn-ər)
(härdn-ər)n.
One that hardens, especially a substance added to varnish or paint to give it a harder surface or finish.
- parthenogenesis
- parthenogenetic
- parthenogenetically
- parthenogenic
- Parthenon
- parthenote
- Parthia
- Parthian
- partial
- partial-birth abortion
- partial derivative
- partial differential equation
- partial differentiation
- partial dominance
- partial eclipse
- partial fraction
- partiality
- partially
- partialness
- partial pressure
- partial seizure
- partial tone
- partible
- participance
- participant