c.1300, "wooden framework for stretching cloth," via O.Fr. (the evolution of the ending is obscure), probably ult. from L.
tentorium "tent made of stretched skins," from
tentus "stretched," variant pp. of
tendere "to stretch" (see
tenet). The compound
tenterhook (1480) is "one of the hooks that holds cloth on a tenter." The figurative phrase
on tenterhooks "in painful suspense" is from 1748; earlier
to be on tenters (1533).