Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
The word instratio could not be parsed. Trying a normal dictionary lookup:
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instrātum, i, n. [insterno], a covering (ante- and post-class.), Cato, R. R. 10, 3; Dig. 50, 16, 45.
1. instrātus, a, um, Part., from insterno.
* 2. in-strātus, a, um, adj. [2. insterno], not covered or spread over: cubile, an unspread couch, Verg. G. 3, 230 (so interpp. plur. ad loc.; but it is better to construe instrato as part. of insterno, with frondibus hirsutis; cf.: instrata cubilia fronde, Lucr. 5, 987 Wakef. ad loc.).