pes·ti·cide 
(pĕstĭ-sīd′)
(pĕstĭ-sīd′)n.
A substance or agent used to kill pests, such as unwanted or harmful insects, rodents, or weeds.
pes′ti·cidal (-sīdl) adj.
- hydrochore
- hydrochory
- hydrocodone
- hydrocolloid
- hydrocolloidal
- hydrocortisone
- hydrocrack
- hydrocracker
- hydrocracking
- hydrocyanic acid
- hydrodynamic
- hydrodynamical
- hydrodynamically
- hydrodynamicist
- hydrodynamics
- hydroelectric
- hydroelectrically
- hydroelectricity
- hydrofluoric acid
- hydrofluorocarbon
- hydrofoil
- hydroformer
- hydroforming
- hydrogen
- hydrogenase