attack - a sudden occurrence of an uncontrollable condition; "an attack of diarrhea"

laryngospasm - a closure of the larynx that blocks the passage of air to the lungs

embolism - occlusion of a blood vessel by an embolus (a loose clot or air bubble or other particle)

thromboembolism - occlusion of a blood vessel by an embolus that has broken away from a thrombus

thrombosis - the formation or presence of a thrombus (a clot of coagulated blood attached at the site of its formation) in a blood vessel

coronary occlusion - occlusion of a coronary artery caused either by progressive atherosclerosis or by a blood clot

meteorology - the earth science dealing with phenomena of the atmosphere (especially weather)

front - (meteorology) the atmospheric phenomenon created at the boundary between two different air masses

spatial relation, position - the spatial property of a place where or way in which something is situated; "the position of the hands on the clock"; "he specified the spatial relations of every piece of furniture on the stage"

dental medicine, dentistry, odontology - the branch of medicine dealing with the anatomy and development and diseases of the teeth

breech closer, breechblock - a metal block in breech-loading firearms that is withdrawn to insert a cartridge and replaced to close the breech before firing

impedimenta, obstruction, obstructor, obstructer, impediment - any structure that makes progress difficult

plug, stopper, stopple - blockage consisting of an object designed to fill a hole tightly

vapor lock, vapour lock - a stoppage in a pipeline caused by gas bubbles (especially a stoppage that develops in hot weather in an internal-combustion engine when fuel in the gas line boils and forms bubbles that block the flow of gasoline to the carburetor)

obstruction - the act of obstructing; "obstruction of justice"

implosion - the initial occluded phase of a stop consonant