[ˌadv(ə)nˈtɪʃəs]adjective
happening or carried on according to chance rather than design or inherent nature
偶然的
adventitious similarities.
一些偶然相似点。
■[coming from] outside; not native
外来的；非自然的
the adventitious population.
外来人口。
■(Biology)formed accidentally or in an unusual anatomical position
(生)偶生的，不定的
adventitious lobes may appear between the primaries.
偶生裂片可能出现在初级飞羽之间。
■(Botany)(of a root) growing directly from the stem or other upper part of a plant
(植)（根）不定的

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派生
adventitiously
adverb

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语源
early 17th cent.: from Latin adventicius 'coming to us from abroad' (from advenire 'arrive') + -ous(see also -itious)