self-fitting
adjEtymology From self- + fitting.
1
Of a candle: having a specially shaped or tapered base that will fit various different sizes of holder.
- After a time Mr. John Dormouse and his daughter began to sell peppermints and candles. But they did not keep "self-fitting sixes"; and it takes five mice to carry one seven inch candle.1909, Beatrix Potter, The Tale of Ginger and Pickles:
2
Of a hearing aid: programmable by the user to suit their own needs.