Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
* con-terrānĕus, i, m. [terra], a fellow-countryman (castrense verbum), Plin. praef. § 1 (Codd. Barb. concerraneum = congerronem, which is perh. better; cf. Sillig ad h. l.).