'storeroom' is a compound word in English, formed from 'store' and 'room', where 'store' means 'to keep or accumulate for future use' and 'room' means 'an enclosed space within a building'.

'Storeroom' was formed in English by combining 'store' and 'room', both of which have roots in Old French and Old English, and became a common term in modern English.

Initially, it simply meant 'a room for storage', and this meaning has remained unchanged in modern usage.