rigol or rigoll /rigˈəl/

1. A gutter or water channel
2. A groove, esp an encircling groove
3. A circlet (Shakespeare)

• vertex
• vertexes
• vertical
• vertical angles
• vertical circle
• vertical circles
• vertical grouping
• vertical integration
• vertical integrations
• verticalities
• verticality
• vertically
• vertically challenged
• verticalness
• verticalnesses
• verticals
• vertical scanning
• vertical take-off
• vertical thinking
• vertices
• verticil
• verticillaster
• verticillasters
• verticillate
• verticillated