1. 
[syn: barbed, barbellate, briary, briery, bristled, bristly, burred, burry, prickly, setose, setaceous, spiny, thorny]
The Collaborative International Dictionary of English v.0.48:
Burr \Burr\, v. i. [imp. & p. p. Burred; p. pr. & vb. n.
   Burring.]
   To speak with burr; to make a hoarse or guttural murmur.
   --Mrs. Browning.
   [1913 Webster]
WordNet (r) 3.0 (2006):
burred
    adj 1: having or covered with protective barbs or quills or
           spines or thorns or setae etc.; "a horse with a short
           bristly mane"; "bristly shrubs"; "burred fruits";
           "setaceous whiskers" [syn: barbed, barbellate,
           briary, briery, bristled, bristly, burred,
           burry, prickly, setose, setaceous, spiny,
           thorny]