poste restante
/pəʊst ˈrɛst(ə)nt
/noun [mass noun] British
A service offered by a post office whereby mail is kept for an agreed period until collected by the addressee.I was backpacking around central America when I got a message, poste restante, from Sophia, inviting me to her birthday party: ‘We're in Belize - why don't you come and join us?‘
Origin
Mid 18th century: from French, literally 'mail remaining'.