Definitions
1.NounThe total destruction of something.
2.NounThe concealing or covering of something.
3.NounThe cancellation, erasure or deletion of something.
4.NounThe cancellation of the function, structure, or both of a vessel or organ; for example, the occlusion of the lumen of a duct, blood vessel, or lymphatic vessel, be it solely functional (as when squeezed by nearby mass effect or inflammation) or both structural and functional (as when clogged with thrombus, embolus, or fibrosis).