'chemically-linked' originates from the word 'chemical,' which comes from the Greek word 'khēmeia,' meaning 'alchemy,' and 'link,' which comes from Old English 'hlencan,' meaning 'to join or connect.'

'chemical' evolved from the Greek 'khēmeia' to the Latin 'chimicus,' and eventually became the modern English word 'chemical.' 'Link' evolved from Old English 'hlencan' to Middle English 'linken,' and eventually became the modern English word 'link.'

Initially, 'chemical' referred to alchemy, but over time it evolved to mean substances and reactions in modern science. 'Link' has largely retained its meaning of connection.