Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
vellĭcātĭo, ōnis, f. [vellico], a plucking, twitching; trop., a twitting, taunting (postAug.): cum non tantum lacerationes, sed etiam vellicationes effugerit, Sen. Vit. Beat. 5, 3; id. Ira, 3, 43, 5.