Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
dūmētum or dummetum (another form: DUMECTA antiqui quasi DUMICETA appellabant, quae nos dumeta, Paul. ex Fest. p. 67, 10 Müll.), i, n. [dumus], thorn-bushes, thorn-hedge, thicket.