You asked a great question! I understand your confusion. The term "aromatic" has two different meanings in chemistry. In the context of organic chemistry, aromaticity refers to a specific property of some cyclic compounds, while in everyday language, "aromatic" is often used to describe substances with a pleasant odor.
In organic chemistry, aromaticity refers to a property of certain cyclic compounds that exhibit a particular type of electronic structure called aromatic character. Aromatic compounds, according to the Hückel's rule, typically have a cyclic, planar structure, a conjugated system of π electrons, and follow the 4n+2 π electron rule (where n is an integer). Examples of aromatic compounds include benzene and its derivatives.
On the other hand, the term "aromatic" used to describe a substance's odor is unrelated to the concept of aromaticity in chemistry. In everyday language, "aromatic" simply means having a pleasant, distinctive smell. Farnesol, in this context, is referred to as aromatic because it has a pleasant odor, often described as floral or woody, but it does not possess the cyclic structure and aromatic character defined in organic chemistry.
So, the term "aromatic" has different meanings depending on whether you are referring to the chemical concept of aromaticity or the everyday sense of a substance having a pleasant odor. In the case of farnesol, it is considered aromatic in terms of its odor but not in the sense of aromaticity in organic chemistry.