her·bi·cide 
(hûrbĭ-sīd′, ûr-)
(hûrbĭ-sīd′, ûr-)n.
A substance used to destroy or inhibit the growth of plants, especially weeds.
her′bi·cidal (-sīdl) adj.
- position effect
- positioner
- position paper
- position vector
- positive
- positive law
- positively
- positiveness
- positivism
- positivist
- positivistic
- positivity
- posit on
- posit on (or upon)
- positron
- positron emission tomography
- positronium
- posit upon
- posole
- posology
- poss.
- posse
- posse comitatus
- possess
- possessed