Wordnet 3.0
NOUN (1)
1. 
 two-year-old sheep; 
The Collaborative International Dictionary of English v.0.48:
Teg \Teg\, n.
   A sheep in its second year; also, a doe in its second year.
   [Prov. Eng.] --Halliwell.
   [1913 Webster]
WordNet (r) 3.0 (2006):
teg
    n 1: two-year-old sheep