Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
vōcŭlātĭo, ōnis, f. [vocula], the intonation, accentuation of words, accent (anteclass.), Nigid. ap. Gell. 13, 25, 1; cf. Gell. 13, 25, 3, and 13, 6, 1.