introit
Concise Oxford English Dictionary © 2008 Oxford University Press:
introit /ˈɪntrɔɪt, ɪnˈtrəʊɪt/
▶noun a psalm or antiphon sung or said while the priest approaches the altar for the Eucharist.
– origin ME: via OFr. from L. introitus, from introire ‘enter’, from intro- ‘to the inside’ + ire ‘go’.
'introit' also found in these Oxford entries:

