Source : Webster's Revised Unabridged Dictionary (1913)

Amanuensis \A*man`u*en"sis\, n.; pl. {Amanuenses}. [L., fr. a,
   ab + manus hand.]
   A person whose employment is to write what another dictates,
   or to copy what another has written.

Source : WordNet®

amanuensis
     n : someone skilled in the transcription of speech (especially
         dictation) [syn: {stenographer}, {shorthand typist}]
     [also: {amanuenses} (pl)]