rigol or rigoll /rigˈəl/

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

• nitric
• nitric acid
• nitric anhydride
• nitric oxide
• nitride
• nitrided
• nitrides
• nitriding
• nitridings
• nitrification
• nitrifications
• nitrified
• nitrifies
• nitrify
• nitrifying
• nitrile
• nitriles
• nitrite
• nitrites
• nitro
• nitro-
• nitroaniline
• nitrobacteria
• nitrobenzene
• nitrobenzenes