Wordnet 3.0
ADJECTIVE (1)
1. 
 capable of being divided or dissociated; 
- Example: "often drugs and crime are not dissociable"- Example: "the siamese twins were not considered separable"- Example: "a song...never conceived of as severable from the melody";[syn: dissociable, separable, severable]
The Collaborative International Dictionary of English v.0.48:
Severable \Sev"er*a*ble\, a.
   Capable of being severed. --Encyc. Dict.
   [1913 Webster]
WordNet (r) 3.0 (2006):
severable
    adj 1: capable of being divided or dissociated; "often drugs and
           crime are not dissociable"; "the siamese twins were not
           considered separable"; "a song...never conceived of as
           severable from the melody"; [syn: dissociable,
           separable, severable]