Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
prō-ruptĭo, ōnis, f. [prorumpo], a breaking or rushing forth, an eruption (post-class.): hostium, a sally, sortie, Aur. Vict. Caes. 33: undarum, Mart. Cap. 6, § 624.
Absol., Mart. Cap. 8, § 804.