Wordnet 3.0
ADJECTIVE (1)
1. 
 capable of being cleaved; 
The Collaborative International Dictionary of English v.0.48:
Cleavable \Cleav"a*ble\, a.
   Capable of cleaving or being divided.
   [1913 Webster]
WordNet (r) 3.0 (2006):
cleavable
    adj 1: capable of being cleaved