Sender is from agent noun from 'send' + '-er'; 'send' is from Old English 'sendan', from Proto-Germanic *sandijaną. The historical chain includes Old English sendan and Proto-Germanic *sandijaną. Older glosses in the chain include "send", "-er", and "sendan", which help explain the semantic range of the modern word. Morphologically, sender is best read as compound and borrowing, yielding an English noun shaped by both form history and later usage. In current English it functions as a noun, with the sense "a person or device that sends something, such as a message". related forms include send and sending. The result is an English noun whose etymology preserves the older forms while supporting the word's specialized modern meaning.