Wordnet 3.0
NOUN (1)
1. 
 a treatise resembling a Brahmana but to be read or expounded by anchorites in the quiet of the forest; 
WordNet (r) 3.0 (2006):
Aranyaka
    n 1: a treatise resembling a Brahmana but to be read or
         expounded by anchorites in the quiet of the forest