Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
spūto, āre, v. freq. a. [spuo], to spit, spit out (mostly ante-class.): sanguinem, Plaut. Merc. 1, 2, 30: morbus, qui sputatur, that disease before which one spits, i. e. the epilepsy, id. Capt. 3, 4, 18 (cf. Plin. 10, 23, 33, § 69; 28, 4, 7, § 35): mixtos sputantem sanguine dentes, Ov. M. 12, 256.