The Collaborative International Dictionary of English v.0.48:

Ilk \Ilk\, a. [Scot. ilk, OE. ilke the same, AS. ilca. Cf.
   Each.]
   Same; each; every. [Archaic] --Spenser.
   [1913 Webster]

   Of that ilk,
   (a) denoting that a person's surname and the title of his
       estate are the same; as, Grant of that ilk, i.e., Grant
       of Grant. [Scottish] --Jamieson.
   (a) Of the same kind.
       [1913 Webster +PJC]

The Collaborative International Dictionary of English v.0.48:

Ilk \Ilk\ ([i^]lk), n.
   Kind; class; sort; type; as, him and his ilk; -- sometimes
   used to indicate disapproval when applied to people.
   [1913 Webster +PJC]

WordNet (r) 3.0 (2006):

ilk
    n 1: a kind of person; "We'll not see his like again"; "I can't
         tolerate people of his ilk" [syn: like, ilk]