Elm n.  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.
 Elm beetle Zoöl., one of several species of beetles (esp. Galeruca calmariensis), which feed on the leaves of the elm.
 Elm borer 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).
 Elm butterfly 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.
 Elm moth Zoöl., one of numerous species of moths of which the larvæ destroy the leaves of the elm (esp. Eugonia subsignaria, called elm spanworm).
 Elm sawfly Zoöl., a large sawfly (Cimbex Americana). The larva, which is white with a black dorsal stripe, feeds on the leaves of the elm.

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