'dorsifixed' originates from Latin and English: from Latin 'dorsum' meaning 'back' combined with English past participle 'fixed' (from Latin 'fixus', past participle of 'figere' 'to fasten').

'dorsifixed' is a modern compound formed in scientific/technical English by combining the Latin root 'dors-' (from 'dorsum') with the English participial adjective 'fixed'; it arose through New Latin/Modern English formation rather than evolving through a distinct medieval English word.

Initially and throughout its use it has meant 'fixed or attached by the back (dorsal side)'; the meaning has remained essentially the same in technical contexts.