in·fra·class 
(ĭnfrə-klăs′)
(ĭnfrə-klăs′)n.
A taxonomic category of related organisms ranking below a subclass and above an order or superorder.
- pneumaticity
- pneumatics
- pneumato-
- pneumatograph
- pneumatograph
- pneumatologic
- pneumatological
- pneumatologist
- pneumatology
- pneumatolysis
- pneumatolytic
- pneumatometer
- pneumatometry
- pneumatophore
- pneumectomy
- pneumectomy
- pneumo-
- pneumobacillus
- pneumococcal
- pneumococcus
- pneumoconiosis
- pneumoconiotic
- pneumocystis
- pneumogastric
- pneumogastric nerve