The Collaborative International Dictionary of English v.0.48:
Cowherd \Cow"herd`\ (-h?rd`), n. [AS. c[=u]hyrde; c[=u] cow + hyrde a herder.] One whose occupation is to tend cows. [1913 Webster]WordNet (r) 3.0 (2006):
cowherd n 1: a hired hand who tends cattle and performs other duties on horseback [syn: cowboy, cowpuncher, puncher, cowman, cattleman, cowpoke, cowhand, cowherd]