'leak-resistant' originates from Modern English, specifically the combination of the word 'leak' and the adjective 'resistant', where 'leak' ultimately comes from older Germanic roots meaning 'to let out liquid or gas', and 'resistant' comes from French 'résistant' (from Latin 'resistere') where 're-' meant 'back' and 'sistere' (from 'stare') meant 'to stand'.

'leak-resistant' developed as a compound of 'leak' + 'resistant' in Modern English (hyphenated or written as two words) to describe objects that resist leaks; it did not exist as a single lexical item in Old or Middle English but formed by combining existing words in recent usage.

Initially, 'leak' referred to the escape of liquid or gas and 'resistant' meant 'opposed to' or 'able to withstand'; together they evolved into the adjectival compound meaning 'able to resist leakage'.