Vous avez cherché: sedile (Latin - Anglais)

sedile
sedile, sedilis seat, chair, bench, stool; that which may be sat on; armchair;

sedile sub arbore est.
there is a bench under the tree.

qui habebat sex gradus et summitas throni rotunda erat in parte posteriori et duae manus hinc atque inde tenentes sedile et duo leones stabant iuxta manus singula
the throne had six steps, and the top of the throne was round behind: and there were stays on either side on the place of the seat, and two lions stood beside the stays.