The Collaborative International Dictionary of English v.0.48:

Ignote \Ig*note"\, a. [L. ignotus; pref. in- not + gnotus,
   notus, known, p. p. of gnocere, nocere, to learn to know.]
   Unknown. [Obs.] --Sir E. Sandys. -- n. One who is unknown.
   --Bp. Hacket.
   [1913 Webster]