It would be the active participle of interfere with, i.e., to disrupt or bring something or interpose someone between two or more extreme realities. Jammer would be a word formed with the prefix inter - and the active participle ferens fero ferentis, however the RAE unsupported it, although interference. Also supports other deferential, different, offeror, afferent, preferential prefixes, inferente, benchmark, efferent.