The Collaborative International Dictionary of English v.0.48:

amarelle \amarelle\ n.
   1. 1 any of several varieties of cultivated sour cherry trees
      of the species Prunus cerasus bearing fruit with
      colorless juice, e.g. Prunus cerasus caproniana.
      [WordNet 1.5 +PJC]

   2. a pale red sour cherry with colorless or nearly colorless
      juice.
      [WordNet 1.5]

WordNet (r) 3.0 (2006):

amarelle
    n 1: any of several cultivated sour cherry trees bearing pale
         red fruit with colorless juice [syn: amarelle, Prunus
         cerasus caproniana]
    2: pale red sour cherry with colorless or nearly colorless juice