blowhole
Concise Oxford English Dictionary © 2008 Oxford University Press:
blowhole/ˈbləʊhəʊl/
▶noun
- 1 the nostril of a whale or dolphin on the top of its head.
- 2 a hole in ice for breathing or fishing through.
- 3 a vent for air or smoke in a tunnel or other structure.
'blowhole' also found in these Oxford entries:

