'fir-like' originates from the English word 'fir,' which refers to a type of evergreen tree, combined with the suffix '-like,' indicating resemblance.

The word 'fir' comes from Old English 'fyrh,' which referred to a coniferous tree, and 'like' from Old English 'lic,' meaning 'having the form of.'

Initially, it meant 'having the form of a fir tree,' and this meaning has largely remained the same in modern usage.