'internally-spored' originates from English compounds formed from 'internal' (from Latin 'internus') and 'spore' (from Greek 'spora'), where 'internus' meant 'inward' and 'spora' meant 'seed' or 'that which is sown'.

'internal' comes via Latin 'internus' into Middle English as 'internal', and 'spore' comes from Greek 'spora' through Late Latin and Old French into Middle English; the modern compound 'internally-spored' is a descriptive 20th-century English formation combining these elements.

Initially, the separate elements meant 'inward' and 'seed/that which is sown'; combined in modern technical usage they mean 'having spores formed inside', a specialized descriptive term in biology.