The Collaborative International Dictionary of English v.0.48:

Rompu \Rom"pu\, a. [F. rompu, p. p. of rompre to breeak, L.
   rumpere. See Rupture.] (Her.)
   Broken, as an ordinary; cut off, or broken at the top, as a
   chevron, a bend, or the like.
   [1913 Webster]