Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
ensĭcŭlus, i, m. (also ensĭcŭla, ae, f., acc. to Probus ap. Prisc. p. 618 fin.), dim. [ensis], a little sword, rapier, Plaut. Rud. 4, 4, 112 sq.