'lymphoid' originates from the Greek word 'lympha,' meaning 'water' or 'clear fluid,' combined with the suffix '-oid,' meaning 'resembling' or 'like.'

'lymphoid' evolved from the Greek word 'lympha' and the suffix '-oid,' eventually becoming the modern English word 'lymphoid.'

Initially, it referred to anything resembling lymph, but over time it became more specific to tissues related to the lymphatic system.