Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
sŭper-stringo, xi, strictum, 3, v. a., to bind or draw together above or over (postclass. and very rare): manus accurate, App. M. 11, p. 263, 31: latera, Sid. Ep. 4, 20.