Related Clues:

• Piercing cry
• Like a useful knife
• Sharp-edged
• Like an eagle's vision
• Pitched too high
• Well-sharpened
• Off-key, perhaps
• Type of triangle
• Sharp, as an appetite
• Like angles less than 90 degrees
• #
• Keen-edged
• Less than 90 degrees, in geometry
• Fresh from honing
• Severe, as pain