Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
nōtor (collat. form ‡ nōtos, v. infra), ōris, m. [nosco], one who knows a person or thing, a voucher, witness, = cognitor (postAug.): qui notorem dat ignotus est, Sen. Ep. 39, 1; Petr. 92; Sen. Apoc. med.; NOTOS (i. e. notor) ADVENISTI, Inscr. Orell. 4957.