- (GEOLOGY) A hole in a cliff
or cave through which seawater spurts at high tide. Blowholes are formed
by erosion. Continued hydraulic action
by pounding waves on the roof of the cave forms a sort of chimney. Eventually
this breaks through the surface of the ground near the edge of the cliff.
At high tide, incoming waves force water out of the top of the blowhole.
- (ZOOLOGY) The nostrils (single
or double) of whales, situated toward the back of the skull.
AND PLANETARY SCIENCE