I. ˌte-lə-ˈfō-(ˌ)tō adjective
Date: circa 1895
: being a camera lens system designed to give a large image of a distant object ; also : relating to or being photography in which a telephoto lens is used
II. noun
( plural -tos )
Date: 1904
1. : a telephoto lens
2. : a photograph taken with a camera having a telephoto lens