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Definition of Hiatus

Hiatus: An opening, as in the diaphragm. When there is an unusually wide opening in the diaphragm, there can be a hiatus (or hiatal) hernia.

In Latin an hiatus is "an opening, gaping mouth, or chasm." It is derived from the verb "hiare" meaning "to gape or yawn." Therefore, a "hiatus" is a gaping opening in anything, such as the opening in a cliff leading into a cave or a break in the conversation in which nothing happens or is said.

Source: MedTerms™ Medical Dictionary
http://www.medicinenet.com/script/main/art.asp?articlekey=19841
Last Editorial Review: 6/14/2012

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