ob-structĭo, ōnis, f. [obstruo], a building before or against, a closing up by building, a blocking up.
I Lit. (post-class.): corporum, Arn. 2, 63.—
II Trop., an obstruction, a barrier : haec obstructio non diuturna est, Cic. Sest. 9, 22.
ob-strūctiō ōnis, f obstruo, an obstruction, barrier : diuturna. ...
An Elementary Latin Dictionary