The Collaborative International Dictionary of English v.0.48:

Mono \Mo"no\, n. [Sp.] (Zool.)
   The black howler (Mycetes villosus), a monkey of Central
   America.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Mono- \Mon"o-\, Mon- \Mon-\ [Gr. ?.]
   A prefix signifying one, single, alone; as, monocarp,
   monopoly; (Chem.) indicating that a compound contains one
   atom, one radical, or one group of that to the name of which
   it is united; as, monoxide, monosulphide, monatomic, etc.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Monophonic \Mon`o*phon"ic\, a. [Mono- + Gr. ? a voice.]
   1. (Mus.) Single-voiced; having but one part; as, a
      monophonic composition; -- opposed to polyphonic.
      [1913 Webster]

   2. Of or relating to a system for recording and reproducing
      sound, which has only one sound channel; also called
      monaural or mono. It contrasts with stereophonic (or
      stereo), quadraphonic, or surround-sound, which have
      two or more channels, and can thus reproduce the effect of
      the sound coming from more than one direction.
      [PJC]