Source : Webster's Revised Unabridged Dictionary (1913)

Verdin \Ver"din\, n. [Cf. Sp. verdino bright green, F. verdin
   the yellow-hammer.] (Zo["o]l.)
   A small yellow-headed bird ({Auriparus flaviceps}) of Lower
   California, allied to the titmice; -- called also {goldtit}.

Source : WordNet®

verdin
     n : very small yellow-headed titmouse of western North America
         [syn: {Auriparus flaviceps}]