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2. Crossword clues
3. Metric prefix between femto- and zepto-

Alternative clues for the word atto

• Quintillionth (prefix)
• It means "quintillionth"
• Prefix meaning "one quintillionth"
• One-quintillionth: Prefix
• Metric prefix that's the reciprocal of exa-
• Quintillionth: Prefix
• It means "billionth of a billionth"
• Prefix for 'quintillionth'
• Prefix meaning ''quintillionth''