The Collaborative International Dictionary of English v.0.48:

Necked \Necked\, a.
   1. Having (such) a neck; -- chiefly used in composition; as,
      stiff-necked.
      [1913 Webster]

   2. (Naut.) Cracked; -- said of a treenail.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Neck \Neck\, v. t. [imp. & p. p. Necked; p. pr. & vb. n.
   Necking.] (Mech.)
   To reduce the diameter of (an object) near its end, by making
   a groove around it; -- used with down; as, to neck down a
   shaft.
   [1913 Webster]

WordNet (r) 3.0 (2006):

necked
    adj 1: having a neck or having a neck especially as specified
           (often used in combination) [ant: neckless]