Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
claudĭtas, ātis, f. [claudus], a lameness, limping (post-Aug.), Plin. 8, 43, 68, § 169; 28, 4, 7, § 35; App. Flor. 16.
In plur., Plin. 28, 4, 6, § 33.