Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
Pătercŭlus, i, m. [pater],
- I. a Roman surname, e. g. C. Velleius Paterculus, the historian; v. Velleius.
Hence,
- II. ‡ Păter-cŭlārĭus, a, um, adj., of or belonging to Paterculus, Not. Tir.