Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
neuter [ˈnjuːtər] vt (cat etc) кастри́ровать (impf/perf)
adj (LING)
neuter noun существи́тельное nt adj сре́днего ро́да
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.