envelopeen‧ve‧lope /ˈɛnvəˌloʊp, ˈɑn-/ ●●● noun [countable] 
the paper cover in which you put a letter [Origin: 1700–1800 French enveloppe, from Old French voloper “to wrap”]
the paper cover in which you put a letter [Origin: 1700–1800 French enveloppe, from Old French voloper “to wrap”]
