"Tenter" redirects here. For the specialised oven also known as a Tenter, see Stenter.
Tenterhooks or tenter hooks are hooked nails in a device called a tenter. Tenters were wooden frames which were used as far back as the 14th century in the process of making woollencloth. They are now superseded by stenter pins.
The phrase "on tenterhooks" has become a metaphor for nervous anticipation.