Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
eccĕre or ĕcĕre, interj. [ecce and abl. of res, see there in fact! lo in truth! Corss. Aussp. 2, 858, 1028; cf. Ribbeck, Partik., p. 43 sq.; not from Ceres, but cf. Ussing ad Plaut. Am. 550], an exclamation of surprise, like Engl. there! (emphatic, only in the foll. passages): Plaut. Am. 2, 1, 4; id. Casin. 2, 6, 34; id. Men. 2, 3, 50; id. Trin. 2, 2, 105; id. Pers. 2, 4, 29; Ter. Ph. 2, 2, 5 (but in Plaut. Mil. 2, 2, 52: ecce autem, Fleck. Lorenz).