rigol or rigoll /rigˈəl/

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

• IOLT
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• Io moth
• ion
• ion channel
• ion channels
• ion engine
• ion engines
• ion-exchange
• ion-exchanges
• Ionian
• ionic
• Ionic
• ionic bond
• ionic bonds
• Ionic dialect
• Ionicise
• Ionicised
• Ionicises
• Ionicising
• Ionicize
• Ionicized
• Ionicizes
• Ionicizing
• Ionic school