Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
rēspersĭo, ōnis, f. [1. respergo], a sprinkling over, besprinkling (Ciceron.): pigmentorum, Cic. Div. 2, 21, 48: ne sumptuosa respersio, a sprinkling of the funeral pile with wine, id. Leg. 2, 24, 60; v. 1. respergo, I.