Source : Webster's Revised Unabridged Dictionary (1913)

Oblanceolate \Ob*lan"ce*o*late\, a. [Pref. ob- + lanceolate.]
   Lanceolate in the reversed order, that is, narrowing toward
   the point of attachment more than toward the apex.

Source : WordNet®

oblanceolate
     adj : of a leaf shape; having a broad rounded apex and a tapering
           base