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comparative more adventitious, superlative most adventitious
From an external source; not innate or inherent, foreign. examples
Accidental, additional, appearing casually. quotations examples
The discovery of the art of making pottery was probably in all cases adventitious, the clay being first used for some other purpose.
1895, Alfred C. Haddon, Evolution in Art, pages 101–102
The adventitious disappearance of those nearer the throne than the duke had, moreover, set tongues awagging.
2002, Colin Jones, The Great Nation, Penguin, published 2003, page 30
(genetics, medicine) Not congenital; acquired. examples
(biology) Developing in an unusual place or from an unusual source. quotations
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;
1985, R. M. T. Dahlgren, H. T. Clifford, P. F. Yeo, The Families of the Monocotyledons, page 101