arising peripherally from parts of the root or stem and having no connection to meristems

Merriam-Webster Online Dictionary
adventitious (adjective)
coming from another source and not inherent or innate - a Federal house without adventitious later additions
arising or occurring sporadically or in other than the usual location - adventitious roots
adventitious (Wikipedia)

Adventitious has various meanings in various disciplines and in general usage.

Adventitious is from the Latin root advenire, meaning "to come to" and in English the meanings tend to have connections to "accidental/ casual occurrence", "arising from without; supervenient, accidental, casual".

People sometimes speak of an event or occurrence as being "random", when the word "adventitious", or perhaps "accidental", might be more strictly correct.

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