The Collaborative International Dictionary of English v.0.48:

Deerberry \Deer"ber`ry\, n. (Bot.)
   A shrub of the blueberry group (Vaccinium stamineum); also,
   its bitter, greenish white berry; -- called also squaw
   huckleberry.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Vaccinium stamineum
    n 1: small branching blueberry common in marshy areas of the
         eastern United States having greenish or yellowish
         unpalatable berries reputedly eaten by deer [syn:
         deerberry, squaw huckleberry, Vaccinium stamineum]