elm

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of various deciduous trees of the genus Ulmus, characteristically having arching or curving branches, serrate leaves with asymmetric bases, and small winged fruit.
• noun The wood of one of these trees.

from The Century Dictionary.

• noun Of other varieties of elm (comprising some trees more or less closely related to the elm and a few belonging to different families but somewhat resembling elms: those given below are among the most important.
• noun The wing-elm or winged elm. See wahoo,.
• noun The winged elm, Ulmus alata, so called in Florida and Arkansas.
• noun Ulmus serotina, a tree of limited distribution on limestone hills and river-banks in southern Kentucky and northern Alabama and Georgia, only recently distinguished from U. fulva, from which it differs in its much smaller fruit, in the absence of mucilage in the inner bark, and in other respects. The wood is reddish in color.
• noun The common name for species of Ulmus (which see), mostly large trees, some common in cultivation for shade and ornament, for which the majestic height and the wide-spreading and gracefully curving branches of the principal kinds admirably adapt them.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Bot.) A tree of the genus Ulmus, of several species, much used as a shade tree, particularly in America. The English elm is Ulmus campestris; the common American or white elm is U. Americana; the slippery or red elm, U. fulva.
• noun (Zoöl.) one of several species of beetles (esp. Galeruca calmariensis), which feed on the leaves of the elm.
• noun (Zoöl.) one of several species of beetles of which the larvæ bore into the wood or under the bark of the elm (esp. Saperda tridentata).
• noun (Zoöl.) one of several species of butterflies, which, in the caterpillar state, feed on the leaves of the elm (esp. Vanessa antiopa and Grapta comma). See Comma butterfly, under Comma.
• noun (Zoöl.) one of numerous species of moths of which the larvæ destroy the leaves of the elm (esp. Eugonia subsignaria, called elm spanworm).
• noun (Zoöl.) a large sawfly (Cimbex Americana). The larva, which is white with a black dorsal stripe, feeds on the leaves of the elm.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun a tree of the genus Ulmus of the family Ulmaceae, large deciduous trees with alternate stipulate leaves and small apetalous flowers
• noun wood from an elm tree

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun hard tough wood of an elm tree; used for e.g. implements and furniture
• noun any of various trees of the genus Ulmus: important timber or shade trees