Merriam-Webster's Collegiate® Dictionary, 11th Edition
BLOCKADE
I. transitive verb (blockaded; blockading)
Date: 1680
to subject to a blockade, block , obstruct , blockader noun
II. noun
Date: 1693
the isolation by a warring nation of an enemy area (as a harbor) by troops or warships to prevent passage of persons or supplies, something that blocks, interruption of normal physiological function (as transmission of nerve impulses) of a cellular receptor, tissue, or organ