Wednesday, April 24, 2013

Word of the Day -- Occlusion

Occlusion: a shutting off or obstruction of something; 2: the coming together of the surfaces of the upper and lower teeth; 3: the front formed by a cold front overtaking a warm front and lifting the warm air above the earth's surface.

"Occlusion" is a descendant of the Latin verb "occludere," meaning "to close up." "Occludere" in turn comes from the prefix "ob-," here meaning "in the way," and the verb "claudere," meaning "to close or shut." "Occlusion" is one of many English terms derived from "claudere." Some others are "recluse," "seclusion," and "exclude." An occlusion occurs when something has been closed up or blocked off. Almost all heart attacks are the result of the occlusion of a coronary (heart) artery by a blood clot. When a person's upper and lower teeth form a "malocclusion," they close incorrectly or badly. An occlusion, or occluded front, happens when a fast-moving cold front overtakes a slow-moving warm front and slides underneath it, lifting the warm air and blocking its movement.
 


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