"Nova Derivativa Verba Latina, Pars Quadringentesima Decima"
"New Latin Derivatives, Part Four Hundred Ten"
Yeah:
extratrum -i n. "thing that goes out"
[extrare "to go out" + -trum agent suffix]
[extra- + -tro-] stems
[extratro-] new stem
[extratrum] nominative singular