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The Collaborative International Dictionary
Coarctation

Coarctation \Co`arc*ta"tion\, n. [L. coarctatio.]

  1. Confinement to a narrow space. [Obs.]
    --Bacon.

  2. Pressure; that which presses. [Obs.]
    --Ray.

  3. (Med.) A stricture or narrowing, as of a canal, cavity, or orifice.

Wiktionary
coarctation

n. 1 (context medicine English) A stenosis, especially of the aorta. 2 (context obsolete English) confinement to a narrow space 3 (context obsolete English) pressure; that which presses

WordNet
coarctation
  1. n. tight or narrow compression [syn: constriction]

  2. (biology) a narrowing or constriction of a vessel or canal; especially a congenital narrowing of the aorta