Wordnet 3.0
NOUN (1)
1. 
 a poet who writes sonnets; 
The Collaborative International Dictionary of English v.0.48:
Sonneteer \Son`net*eer"\, n.
   A composer of sonnets, or small poems; a small poet; --
   usually in contempt.
   [1913 Webster]
         What woful stuff this madrigal would be
         In some starved hackney sonneteer or me! --Pope.
   [1913 Webster]
The Collaborative International Dictionary of English v.0.48:
Sonneteer \Son`net*eer"\, v. i.
   To compose sonnets. --Lowell.
   [1913 Webster]
WordNet (r) 3.0 (2006):
sonneteer
    n 1: a poet who writes sonnets