rumpless - n.
1 the hind part of a mammal, esp. the buttocks.
2 a a small or contemptible remnant of a parliament or similar body. b (the Rump) hist. the remnant of the English Long Parliament 1648-53 or after its restoration in 1659.

rump steak a cut of beef from the rump.

rumpless adj. [ME, prob. f. Scand.]