alder(n = noun.plant)alder tree - north temperate shrubs or trees having toothed leaves and conelike fruit; bark is used in tanning and dyeing and the wood is rot-resistant;
A tree, usually growing in moist land, and belonging to the genus Alnus. The wood is used by turners, etc.; the bark by dyers and tanners. In the U. S. the species of alder are usually shrubs or small trees. [1913 Webster]
Black alder. (a)A European shrub (Rhamnus frangula); Alder buckthorn.(b)An American species of holly (Ilex verticillata), bearing red berries.
, a. Array
Of all; -- used in composition; as, alderbest, best of all, alderwisest, wisest of all. Chaucer. [1913 Webster]