1. The spiracle of a cetacean located far back on the skull
   "We watched as the whale surfaced and expelled water through its blowhole"
    
2. A hole for the escape of gas or air
   "The engineers designed blowholes in the machinery to prevent overheating";
   - vent, venthole, vent-hole

Derived forms: blowholes

Type of: hole, spiracle

Part of: air duct, air passage, airway, blower, cetacean, cetacean mammal

Encyclopedia: Blowhole