There are multiple definitions:

1. upper respiratory [tract] infection(English)

   • Respiratory system

2. Uniform Resource Identifier(English)

   • string of characters that unambiguously identifies a particular resource. To guarantee uniformity, all URIs follow a predefined set of syntax rules, but also maintain extensibility through a separately defined hierarchical naming scheme (e.g. http://)
   • URL
   • Data exchange
   • https://en.wiki…urce_Identifier