Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
agmĭnālis, e, adj. [agmen], pertaining to a march or train (only in the Pandects): equi, pack-horses, Dig. 50, 4, 18, § 21.
Absol.: agminales, Cod. Th. 8, 5, 6.