Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
ēlŭvĭo, ōnis, f. [eluo], older form of eluvies, a washing away, overflowing, inundation: aquarum eluviones, Cic. Div. 1, 49, 111: eluviones et exustiones terrarum, Cic. Rep. 6, 21, 23; id. Off. 2, 5, 16.