adventitious

adj

Etymology: From Medieval Latin adventītius (“coming from abroad, extraneous”), a corruption of Latin adventīcius (“foreign, strange, accidental”), from adventus (“arrival, coming, approach, advent”) + -īcius (suffix forming adjectives), from adveniō (“to arrive”) + -tus (suffix forming action nouns).

1. From an external source; not innate or inherent, foreign.
2. Accidental, additional, appearing casually.

   “In a triad of verbs that admits nothing adventitious, Judah sees, takes, and lies with a woman; […]”

   “The discovery of the art of making pottery was probably in all cases adventitious, the clay being first used for some other purpose.”

3. Not congenital; acquired.
4. Developing in an unusual place or from an unusual source.

   “The Velloziaceae have evolved a woody stem which is covered with a layer of adventitious roots mingled with the fibres of the old leaf sheaths;”