Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
exsectĭo (exect-), ōnis, f. [exseco], a cutting out, excision: illa conscelerata linguae, Cic. Clu. 67, 191: fundi in armario, id. ib. 64, 180.
In plur.: mammarum, Arn. 5, 165.