The Collaborative International Dictionary of English v.0.48:

Dictaphone \Dic"ta*phone\, n. [Dictate + -phone, as in
   telephone.]
   A form of phonographic recorder and reproducer adapted for
   use in dictation, as in business.
   [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

Dictaphone
    n 1: a tape recorder that records and reproduces dictation