ˈ ̷ ̷ˌ ̷ ̷ noun
( -s )
1. : a hole in a metal ingot or casting caused by a bubble of gas captured in the solidifying metal and constituting a flaw or defect
2. : a nostril in the top of the head of a whale or other cetacean, there being two in the whalebone whales and only one in the toothed whales and related forms
3. : a hole or fissure in rocks along a shore through which incoming waves force air to rush upward or water to spout intermittently
4. : a hole in the ice to which aquatic mammals (as whales or seals) come to breathe