Definition of "ish" : -ish \-ish\ [AS. -isc; akin to G. -isch, OHG. -isc, Goth. & Dan. -isk, Gr. ?. Cf. -esque.]
A suffix used to from adjectives from nouns and from adjectives. It denotes relation, resemblance, similarity, and sometimes has a diminutive force; as, selfish, boyish, brutish; whitish, somewhat white.
Source: Webster's Revised Unabridged Dictionary (1913)
-ish \-ish\ [AS. -isc; akin to G. -isch, OHG. -isc, Goth. & Dan. -isk, Gr. ?. Cf. -esque.]
A suffix used to from adjectives from nouns and from adjectives. It denotes relation, resemblance, similarity, and sometimes has a diminutive force; as, selfish, boyish, brutish; whitish, somewhat white. [1913 Webster]
Source: The Collaborative International Dictionary of English v.0.48