A short frenzied search revealed a blowhole in the snow.
"My Attainment of the Pole"
Frederick A. Cook
And every little while, from the big blowhole or nostril on top of her head she would 'spout,' or send up a spray-like jet of steamy breath.
"Children of the Wild"
Charles G. D. Roberts
"A blowhole," Marian informed him briefly.
"Cow-Country"
B. M. Bower