sŭper-sterno, no perf., strātum, 3, v. a.,
to strew or spread upon , to spread over , cover over (very rare): pavimenta testacea, Col. 1, 6, 13: superstrati cumuli, Liv. 10, 29, 19: fossam ponte solubili, Amm. 16, 8, 10.
supersterno see superstratus. ...
An Elementary Latin Dictionary