Wiktionary
n. An emergency landing in which an aircraft drops flat from a low altitude with no wheels deployed.
Usage examples of "pancake landing".
I was watching a Hurricane, whose tail appeared to be badly damaged and whose undercarriage had failed to work, coming slowly in to a pancake landing.
The atomicar zoomed up off the road-cleared the embankment with inches to spare-and finally settled down to a pancake landing in the field beyond as Tom cut off all power.
It banked until its wings were vertical, veered, banked some more until it was upside down, shed what little altitude it had to begin with, and made an upside-down pancake landing in the olive trees no more than a hundred yards distant.
But a moment later Sandy pulled out of it and managed to make a pancake landing!