Espontâneo.
(Lat. ultroneus)
ul-trô-neo
errôneo, quadricotiledôneo, idôneo, sincotiledôneo, acotiledôneo, inidôneo, monopneumôneo, policotiledôneo, ancôneo, unicotiledôneo, poligôneo, cotiledôneo, gorgôneo, dicotiledôneo, alciôneo