monotype (n.)

1881 in biology, "the single or sole type of a species in its genus, a genus in its family, etc.;" 1882 in printers' arts, "a print from a picture painted on a metal plate" (only one proof can be made, as the picture is transferred to the paper); 1893 as a brand name of typesetting machine; see mono- + type. Related: Monotypic (1878 in the biological sense)