elm /ˈɛlm/
 榆樹   ;  (unix操作系統中的一個信件處理程式)


 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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 elm
      n 1: any of various trees of the genus Ulmus: important timber or
           shade trees [syn: elm tree]
      2: hard tough wood of an elm tree; used for e.g. implements and
         furniture [syn: elmwood]


 Elm
    Hos. 4:13; rendered "terebinth" in the Revised Version. It is
    the Pistacia terebinthus of Linn., a tree common in Palestine,
    long-lived, and therefore often employed for landmarks and in
    designating places (Gen. 35:4; Judg. 6:11, 19. Rendered "oak" in
    both A.V. and R.V.). (See TEIL TREE.)