from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A European oak (Quercus petraea) having tough, elastic wood.
from The Century Dictionary and Cyclopedia
- n. A species of oak (Quercus sessiliflora, or, according to some, Q. pubescens) so closely allied to the common oak (Q. Robur) as to be reckoned by some botanists only a variety of it.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. deciduous European oak valued for its tough elastic wood
Perhaps alteration of dun mast : dun2 + mast2.(American Heritage® Dictionary of the English Language, Fourth Edition)