[{"Bold_text": "noun", "List Items": ["an air or gas vent, especially one to carry off fumes from a tunnel, underground passage, etc.", "either of two nostrils or spiracles, or a single one, at the top of the head in whales and other cetaceans, through which they breathe.", "a hole the ice to which whales or seals come to breathe.", "Metallurgy.a defect in a casting or ingot caused by the escape of gas.", "Geology.a hole a sea cliff or coastal terrace through which columns of spray are jetted upward."]}]