'amino-linked' is a modern compound formed by the combining form 'amino-' (used in chemistry) and 'linked' (the past participle of 'link'). 'Amino-' is derived from 'amine', which ultimately traces to 'ammonia' (the name 'amine' and the combining form 'amino-' come from 19th-century chemical nomenclature). 'Link' comes from the English verb 'link', meaning 'to join or connect.'

'Amino-' entered scientific English as a combining form in Neo-Latin/19th-century chemical usage based on 'amine' (from 'ammonia'). 'Link' developed in Old/Middle English and later formed the modern verb 'to link' and its past participle 'linked'. The compound 'amino-linked' is a 20th/21st-century technical formation used in biochemical and synthetic-chemistry contexts.

Initially, 'amino-' identified derivatives related to ammonia; over time it became a productive chemical combining form meaning 'containing or relating to an amino group'. 'Linked' has consistently meant 'joined'; the compound's modern meaning became the specific chemical sense 'joined via an amino group.'