| 单词 | blowhole |
| 释义 | blowhole /bloh"hohl'/, n. 1. an air or gas vent, esp. one to carry off fumes from a tunnel, underground passage, etc. 2. 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. 3. a hole in the ice to which whales or seals come to breathe. 4. Metall. a defect in a casting or ingot caused by the escape of gas. 5. Geol. a hole in a sea cliff or coastal terrace through which columns of spray are jetted upward. [1685-95; BLOW2 + HOLE] |
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