Lewis & Short

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.