The Collaborative International Dictionary of English v.0.48:
Vendor \Vend"or\ (v[e^]nd"[o^]r), n. [See Vender.] A vender; a seller; the correlative of vendee. [1913 Webster]WordNet (r) 3.0 (2006):
vendor n 1: someone who promotes or exchanges goods or services for money [syn: seller, marketer, vender, vendor, trafficker]