In medicine, a chiasma is an intersection, usually with some exchange. The optic chiasmus for e.g., is a broadish structure in which nerve fibres cross from the right to the left and vice-versa, in an X pattern. Chiasma comes from cross shaped and is therefore used for intersections.

Pie: Has anyone heard the usage - You will not get another pie from me. Pie used to signify a small monetary amount - I now am thinking it is short for paise? I think it is a Hindi word that has been absorbed into English or maybe I am suffering from a surfeit of Rushdie and RK Narayan....