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blow·hole

blowhole

 
pronunciation:
blo hol
features:
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part of speech: noun
definition 1: a nostril in the top of the head of a whale, dolphin, or porpoise. The blowhole is used to breathe.
definition 2: a hole in ice that covers a body of water. Whales and other sea mammals come to blowholes to breathe.
definition 3: a vent to let out air or gases.
It is important to have a blowhole in an underground tunnel.
similar words:
vent
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See
  breathe, head, respiration