Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
strangŭlātĭo, ōnis, f. [strangulo], a choking, suffocating, strangulation (post-Aug.), Plin. 23, 1, 13, § 59: vulvae, suffocation of the womb, id. 20, 15, 57, § 162; cf. strangulatus.