Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
cŭnīcŭlātus, a, um, adj. [cuniculus], in the form of a channel or tube (post-Aug. and rare): rostrum, Plin. 9, 36, 61, § 130 Sillig and Jan. (al. cuniculatim).