ball-peen hammer 
(bôlpēn′)
(bôlpēn′)n.
A hammer having one end of the head hemispherical and used in working metal.
ball-peen hammer- orthogenesis
- orthogenetic
- orthogenetically
- orthogonal
- orthogonality
- orthogonally
- orthogonal projection
- orthograde
- orthographer
- orthographic
- orthographical
- orthographically
- orthographist
- orthography
- ortholog
- orthologous
- orthologue
- orthomolecular
- orthomyxovirus
- orthopaedics
- orthopedic
- orthopedically
- orthopedics
- orthopedist
- orthopsychiatric