The Collaborative International Dictionary of English v.0.48:
mop-headed \mop-headed\ adj. having a bushy top without a leader; -- of trees; as, mop-headed cabbage palms. Syn: mopheaded. [WordNet 1.5]WordNet (r) 3.0 (2006):
mop-headed adj 1: (of trees) having a bushy top without a leader; "mop- headed cabbage palms"