Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
ē-vāgīno, no perf., ātum, 1, v. a. [vagina], to draw out of the scabbard, to unsheath (post-class.): gladio sua sponte evaginato, Just. 1, 9, 8; Hyg. Fab. 164; Vulg. Exod. 15, 10: pugionem, id. Judith, 13, 9.