NOSTR..... How to pronounce it? Well this got me thinking about my country of birth, Wales in the the UK. Every night before sleep my family would say.... 'Nos Dda.' How do you say goodnight in Welsh? Wondering how to say goodnight in Welsh? It's simply, 'nos da', with nos meaning night and da meaning good. So, for myself the pronunciation of NOSTR is practically the same as the Welsh expression for goodnight. GN Nos da Cariad. https://youtu.be/VgfM9puZbCE