Wiktionary
n. (context Internet English) A proxy that retrieves information on behalf of a client from a/several servers
Wikipedia
In computer networks, a reverse proxy is a type of proxy server that retrieves resources on behalf of a client from one or more servers. These resources are then returned to the client as if they originated from the proxy server itself. While a forward proxy acts as an intermediary for its associated clients to contact any server, a reverse proxy acts as an intermediary for its associated servers to be contacted by any client.
Quite often, popular web servers utilize reverse-proxying functionality, acting as shields for application frameworks with weaker HTTP capabilities.
Usage examples of "reverse proxy".
Proxy Server uses a process known as reverse proxy to provide security while simultaneously allowing your company to publish on the Internet.