Hypertext Webster Gateway: "obstructor"
From WordNet (r) 1.7 (wn)
obstructor
n 1: someone who systematically obstructs some action that others
want to take [syn: {obstructionist}, {obstructer}, {resister},
{thwarter}]
2: any structure that makes progress difficult [syn: {obstruction},
{obstructer}, {impediment}, {impedimenta}]
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