The Collaborative International Dictionary of English v.0.48:
Monotype \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. [1913 Webster]WordNet (r) 3.0 (2006):
monotypic adj 1: consisting of only one type