Words: tryst [MW]

Pronunciation: \ˈtrist, especially British ˈtrīst\
Function: noun
Etymology: Middle English triste appointed station for hunters, probably from trist, trust confidence, trust
Date: 14th century
1 : an agreement (as between lovers) to meet
2 : an appointed meeting or meeting place

(I had never heard tryst pronounced with the short i until this week. It's apparently British usage to use the long i, though it seems logical at first glance on the analogy of try.)