1. a suffix of verbs having a frequentative force: dazzle; twinkle.
2. a suffix of adjectives formed originally on verbal stems and having the sense of “apt to”: brittle.
3. a noun suffix having originally a diminutive meaning: bramble.
4. a noun suffix indicating agent or instrument: beadle; bridle; thimble.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.