Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
palpĭtātĭo, ōnis, f. [palpito], a frequent and rapid motion, a palpitation: cordis, a palpitation of the heart, Plin. 32, 5, 18, § 49: oculorum, a blinking, id. 32, 10, 46, § 132: partium singularum, id. 11, 4, 3, § 10.