Lewis Short
(verb) : sŭper-sterno, no
* Perf., strātum, 3, , 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.
Charlton T. Lewis, Charles Short, A Latin Dictionary