Meaning of trestletree

tres•tle•tree

Pronunciation: (tres'ul-trē"), [key]
— n. Naut.
  1. either of a pair of timbers or metal shapes lying along the tops of the hounds or cheeks of a mast to support crosstrees or a top.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.