'cestode-related' is a compound formed in modern English from 'cestode' + the English suffix '-related'. 'cestode' ultimately comes from Greek 'kēstōdēs' via New Latin, where 'kēstós' meant 'girded' (referring to the ribbon- or belt-like body of tapeworms).

'cestode' passed into scientific New Latin as 'Cestoda' from Greek 'kēstōdēs' and entered English as 'cestode' in modern scientific usage; '-related' derives from English 'related', itself from Latin roots via Old French ('relater'/'relatus'). Over time these elements were combined in English to form compound adjectives like 'cestode-related'.

Initially the Greek root described a 'girded' or 'belt-like' form; over time it became the technical term for the class of parasitic flatworms ('cestode'/Cestoda). The compound 'cestode-related' now means 'connected with or pertaining to those organisms or their effects'.