introducer. a heavy metal fist-sized instrument to which a wire saw can be attached to be introduced into the uterus of a cow or mare and dropped over the part to be sawed.The weight and shape of the introducer ensure that it is easily found and pulled out with the wire attached, so that the fetotome can then be threaded.ot, as Eustace hinted, that there was any real necessity for my services as introducer, inasmuch as his own name had become established in some good degree of favor with the literary world. Tanglewood Tales by Hawthorne, Nathaniel View in context.