Diameter components

• Spoke lines?
• Parts of forearms
• Pizza slice borders, e.g
• Circle measures
• Bicycle spokes e.g.,
• Spokes, say
• Pizza cut edges, e.g
• Pie chart sections

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Radii \Ra"di*i\ (r[=a]"d[i^]*[imac]), n., pl. of Radius .

Wiktionary Word definitions in Wiktionary
n. (plural of radius English)