bar·rel·head 
(bărəl-hĕd′)
(bărəl-hĕd′)n.
The flat top of a barrel.
- participate
- participation
- participational
- participative
- participator
- participatory
- participial
- participially
- participle
- particle
- particle accelerator
- particle beam
- particleboard
- particle board
- particle decay
- particle physics
- parti-colored
- particular
- particularism
- particularist
- particularistic
- particularity
- particularization
- particularize
- particularizer