Definition of -y suffix from the Oxford Advanced Learner's Dictionary

  1. 1(also -ey) (in adjectives) full of; having the quality of dusty clayey
  2. 2(in adjectives) tending to runny sticky
  3. 3(in nouns) the action or process of inquiry
  4. 4(also -ie) (in nouns, showing affection) doggy daddy
See the Oxford Advanced American Dictionary entry: -y