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The Collaborative International Dictionary of English v.0.48 (gcide)

Alder \Al"der\ ([add]l"d[~e]r), Aller \Al"ler\ ([add]l"l[~e]r),
a. [From ealra, alra, gen. pl. of AS. eal. The d is
excrescent.]
Of all; -- used in composition; as, alderbest, best of all,
alderwisest, wisest of all. [Obs.] --Chaucer.
[1913 Webster] alderfly


Alder \Al"der\ ([add]l"d[~e]r), n. [OE. aldir, aller, fr. AS.
alr, aler, alor, akin to D. els, G. erle, Icel. erlir, erli,
Swed. al, Dan. elle, el, L. alnus, and E. elm.] (Bot.)
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.
[1913 Webster] Alder