1. [n]  a typesetting machine operated from a keyboard that sets separate characters
2. [n]  (biology) a taxonomic group with a single member (a single species or genus)

MONOTYPE is a 8 letter word that starts with M.

1. \Mon"o*type\, Monotypic \Mon`o*typ"ic\, a. [Mono- +
   -type: cf. F. monotype.] (Biol.)
   Having but one type; containing but one representative; as, a
   monotypic genus, which contains but one species.
   
   

2. \Mon"o*type\, n. [Mono- + -type.]
   1. (Biol.) The only representative of its group, as a single
      species constituting a genus.
   
   2. A print (but one impression can be taken) made by painting
      on metal and then transferring the painting to paper by
      pressure; also, the process of making such prints.
   
   3. A kind of typesetting and casting machine that makes and
      sets individual types.