'anteromedially' originates from Latin via modern medical English, specifically from the combining form 'antero-' (from Latin 'ante' meaning 'before, in front of') and 'medialis' (from Latin 'medius' meaning 'middle'), plus the English adverbial suffix '-ly'.

'anteromedially' changed from the modern adjective 'anteromedial' (formed in anatomical/medical English from 'antero-' + 'medial') and then became the adverb 'anteromedially' by adding the suffix '-ly'.

Initially, the components meant 'before/in front' ('antero-') and 'middle' ('medial'); over time they combined in anatomical usage to mean 'toward the front and middle', and the adverbial form came to mean 'in that direction' or 'in that position'.