billon /bilˈən/

1. Base metal
2. Esp an alloy of silver with copper, tin, or the like

• focal distance
• focal distances
• focal infection
• focal infections
• focalisation
• focalisations
• focalise
• focalised
• focalises
• focalising
• focalization
• focalizations
• focalize
• focalized
• focalizes
• focalizing
• focal length
• focal lengths
• focally
• focal plane
• focal planes
• focal-plane shutter
• focal-plane shutters
• focal point
• focal points