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Adventitious is a 12 letter word which starts with the letter A and ends with the letter S for which we found 4 definitions.

(a.) Added extrinsically; not essentially inherent; accidental or causal; additional; supervenient; foreign.
(a.) Out of the proper or usual place; as adventitious buds or roots.
(a.) Accidentally or sparingly spontaneous in a country or district; not fully naturalized; adventive; -- applied to foreign plants.
(a.) Acquired as diseases; accidental.
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