Obs. rare. [f. COARCT v., after act-ion, etc.: see -ION.] Coarctation, constriction.
1782. A. Monro, Compar. Anat. (ed. 3), 7. Nor is there any coarction forming the antrum willisii as in the stomach of man. Ibid., 18. These coarctions give way in the time of birth.
