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]

Moby Thesaurus II by Grady Ward, 1.0:

77 Moby Thesaurus words for "ilk":
   blood, body-build, brand, breed, cast, character, characteristic,
   characteristics, clan, color, complexion, composition,
   constituents, constitution, crasis, denomination, description,
   designation, dharma, diathesis, disposition, ethos, feather, fiber,
   form, frame, genius, genre, genus, grain, habit, hue, humor,
   humors, kidney, kin, kind, label, line, lot, make, makeup, manner,
   mark, mold, nature, number, persuasion, phylum, physique, property,
   quality, race, shape, somatotype, sort, species, spirit, stamp,
   strain, streak, stripe, style, suchness, system, temper,
   temperament, tendency, tenor, the like of, the likes of, tone,
   tribe, type, variety, vein, way