Origin: 1300–50; Middle English tente to stretch (< Latin tentus, variant of tēnsustense1) + -er1; replacing Middle English teyntur, of unclear derivation
c.1300, "wooden framework for stretching cloth," via O.Fr. (the evolution of the ending is obscure), probably ultimately from L. tentorium "tent made of stretched skins," from tentus "stretched," variant pp. of tendere "to stretch" (see tenet).