algorism /alˈgə-ri-zm/

1. The Arabic system of numeration
2. Arithmetic
3. An algorithm

• button up
• buttonwood
• buttonwoods
• buttony
• button your lip
• butt out
• buttress
• buttressed
• buttresses
• buttressing
• buttress-root
• buttress-roots
• buttress-thread
• buttress-threads
• butts
• butt-shaft
• butt-shafts
• butt-ugly
• butt welding
• butty
• butty-collier
• butty-colliers
• butty-gang
• butty-gangs
• buttyman