The word 'vendor' has a transparent commercial lineage directly from Latin. It is formed from the verb vendere, meaning 'to sell', which itself is a compound of venum (that which is for sale) and dare (to give). The suffix -or was attached to create venditor in Late Latin, denoting 'a seller'. This term passed into Anglo-Norman and later Middle English, where it was simplified to 'vendor'. The logic is straightforward: one who gives something for sale. The modern meaning retains this core sense of an agent engaged in selling, whether an individual street seller or a large corporate entity.

Structure: vend (sell) + or (person/agent) - vend: From Latin vendere (to sell), from venum (something for sale) + dare (to give). Functions as the core verbal root. - or: From Latin -or, a suffix forming agent nouns from verbs, indicating a person or thing that performs the action. Functions as a nominalizing suffix.