The Collaborative International Dictionary of English v.0.48:
Obstipation \Ob`sti*pa"tion\, n. [L. obstipatio a close pressure; ob (see Ob-) + stipare to press.] 1. The act of stopping up, as a passage. [Obs.] --Bailey. [1913 Webster] 2. (Med.) Extreme constipation. [Obs.] --Hooper. [1913 Webster]WordNet (r) 3.0 (2006):
obstipation n 1: severe constipation resulting from an obstruction in the intestines