Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
missĭto, āvi, ātum, 1, v. freq. a. [mitto], to send repeatedly, to send (not in Cic. or Cæs.): supplicantes legatos, Sall. J. 38, 1: auxilia, Liv. 9, 45, 5: litteras, Front. de Eloq. p. 234 Mai.: codicillos missitatos, Plin. 33, 1, 4, § 12.