Lewis Short
ob-structÄo (noun F) : obstruo
* A building before or against, a closing up by building, a blocking up.
* Lit. (post-class.): corporum,Arn. 2, 63.
* Trop., an obstruction, a barrier: haec obstructio non diuturna est,Cic. Sest. 9, 22.
Charlton T. Lewis, Charles Short, A Latin Dictionary