rigol or rigoll /rigˈəl/

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

• blister card
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• blistered
• blistered-steel
• blister fly
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• Boolean
• Boolean algebra
• Boolean algebras
• Boolean expression
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• boombox
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• boomerang
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• boomier