[1700–10; spy + glass]This word is first recorded in the period 1700–10. Other words that entered Englishat around the same time include: cozy, emphatic, envelope, hump, marquise
Examples of 'spyglass' in a sentence
spyglass
His spyglass is focused on the region to the east and the south.
Times, Sunday Times (2008)
Fit a door viewer/ spyglass to the front door as well (about 10).
Times, Sunday Times (2010)
True, the pickings from such vessels are usually slim, but peek through the spyglass and this one looks a treat.