ex-voto
Concise Oxford English Dictionary © 2008 Oxford University Press:
ex-voto /ɛks ˈvəʊtəʊ/
▶noun (pl. ex-votos) an offering given in order to fulfil a vow.
– origin C18: from L. ex voto ‘from a vow’.
'ex-voto' also found in these Oxford entries:

