Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
* tintinnācŭlus, a, um, adj. [tintinno], tinkling, clinking, clanking: educi ad tintinnaculos, i. e. to the manacled malefactors, Plaut. Truc. 4, 3, 8 Spengel ad loc. (acc. to others, the executioners who fastened the chains).