From WordNet (r) 3.0 (2006) [wn]:
huckleberry
n 1: any of various dark-fruited as distinguished from blue-
fruited blueberries
2: any of several shrubs of the genus Gaylussacia bearing small
berries resembling blueberries
3: blue-black berry similar to blueberries and bilberries of the
eastern United States
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Huckleberry \Huc"kle*ber`ry\, n. [Cf. Whortleberry.] (Bot.)
(a) The edible black or dark blue fruit of several species of
the American genus Gaylussacia, shrubs nearly related
to the blueberries (Vaccinium), and formerly confused
with them. The commonest huckelberry comes from
Gaylussacia resinosa.
(b) The shrub that bears the berries. Called also
whortleberry.
[1913 Webster]
Squaw huckleberry. See Deeberry.
[1913 Webster]