#91: ogdoad

luckiest digit
mystic, primal number eight
fabled ogdoad

The "infinity" number: 8. From Wikipedia: 

• The "lucky" number in Asian culture 
• The second "magic number" in nuclear physics 
• The atomic number of oxygen 
• Spider legs and octopus arms 
• 8 ounces in a cup, 8 pints in a gallon 

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DEFINITION of this 3-syllable noun: 

1. the number eight.
2. a group of eight.