3. (n.)potty a seat of reduced size fitting over a toilet seat, for use by a small child.
4. potty the pot of a potty-chair.
Etymology: (1840)
Definition of 'potty'
Princeton's WordNet
1. (noun)toilet, can, commode, crapper, pot, potty, stool, throne a plumbing fixture for defecation and urination
2. (adj)chamberpot, potty, thunder mug a receptacle for urination or defecation in the bedroom
3. (adj)enamored, infatuated, in love, potty, smitten, soft on(p), taken with(p) marked by foolish or unreasoning fondness "gaga over the rock group's new album"; "he was infatuated with her"
4. (adj)potty (British informal) trivial "potty little details"