CrosswordOpener.com - we know the word that you can`t guess In case of any inconvenience..
Unfrozen spot on a frozen pond
Else clues• Breathing aid
• Helmet feature
• Ice opening
• Mail-order bride's safety feature, farcically
• Mask feature
• Opening for breathing
• Opening in the ice
• Pet carrier feature
• Pet-carrier vent
• Site for a seal, maybe
• Vent
• Ventilation opening
• Ventilation source