Palmsun
/ˈpɑːmsʌn/ /ˈpɑːmsən/(also Paumsoon) Christian Church. Now English regional (chiefly northern )
noun
In other attributive uses: designating things relating to or connected with Palm Sunday; specifically designating an event held on or around Palm Sunday.
Origin
Middle English (in an earlier sense). Shortened from Palm Sunday. In β form shortened from Palms Sunday.