'fungi-related' is a compound word formed from 'fungi' (the plural of 'fungus') and the suffix '-related', meaning 'connected to' or 'associated with'.

'Fungi' comes from Latin 'fungus', and '-related' is from the verb 'relate', from Latin 'relatus'. The compound 'fungi-related' is a modern English formation.

Initially, it simply meant 'connected to fungi', and this meaning has remained unchanged.