Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
allĭgātūra (adl-), ae, f. [alligo], a band or tie (very rare), Col. Arb. 8, 3; Scrib. Comp. 209; Vulg. 2 Reg. 16, 1; ib. Eccli. 6, 31.