Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
gestĭcŭlātio, ōnis, f. [gesticulor], pantomimic motion, gesticulation (postAug.; syn. gestus): nec sine molli quadam digitorum gesticulatione, Suet. Tib. 68: inaffectata, App. M. 10, p. 254, 18: pronunciatio gesticulationibus molesta, Quint. 11, 3, 183.