py·re·thrin 
(pī-rēthrĭn, -rĕthrĭn)
(pī-rēthrĭn, -rĕthrĭn)n.
Either of two viscous liquid esters, C21H28O3 or C22H28O5, that are extracted from pyrethrum flowers and used as insecticides.
[PYRETHR(UM) + -IN.]
- Congress boot
- congressional
- congressionally
- Congressional Medal of Honor
- congressman
- congressperson
- congresswoman
- Congreve
- congruence
- congruency
- congruent
- congruently
- congruity
- congruous
- congruously
- congruousness
- congé
- coni arteriosi
- conic
- conical
- conically
- conical projection
- conicity
- conic projection
- conic section