Related Clues:

• X-ray unit
• Far out!
• "Wow!"
• More than cool
• Very large
• "Zounds!"
• Bang-up
• 90's kids' catchword
• 'Peachy!'
• 'Sounds swell!'
• "Swell!"
• "That's wonderful!"
• 'Cool'
• Five-star
• Unit of 100 ergs per gram