Rudimentary organs may be compared with the letters in a word, still retained in the spelling, but become useless in the pronunciation, but which serve as a clue for its derivation.
Ahoskatu ez arren oraindik hitzaren barruan idatzirik kontserbatzen diren eta hitzon etimologiaren gakotzat balio duten letrekin konpara daitezke aztarna-organoak.