the word venusian is a modern english formation, constructed by directly appending the adjectival suffix '-ian' to the name of the planet 'venus'. the planet itself was named by ancient roman astronomers after venus, their goddess of love and beauty, due to its brilliant appearance in the sky. the suffix '-ian', derived from the latin '-ianus', is commonly used in english to denote pertinence or origin, as seen in terms like 'martian' or 'victorian'. thus, 'venusian' logically signifies 'pertaining to the planet venus', extending in science fiction to describe its hypothetical inhabitants.

Structure: venus + ian venus (latin, proper noun, the name of the roman goddess of love and beauty, later applied to the planet); ian (english, suffix, forming adjectives and nouns meaning 'belonging to' or 'relating to').