Related Clues:

• Heidi, for one
• Buildup around the mouth
• Mouth locale
• Like the mathematician Euler
• Cheddar alternative
• Cheese with eyes
• Like some secret bank accounts
• Mississippi River feature
• D, in some communications
• Triangular formation
• Chocolate miss?
• Land formation named for its usual shape
• Watchmakers of note
• Greeks' D
• From Lucerne