“sella”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
“sella”, in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
sella in Charles du Fresne du Cange’s Glossarium Mediæ et Infimæ Latinitatis (augmented edition with additions by D. P. Carpenterius, Adelungius and others, edited by Léopold Favre, 1883–1887)
sella in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette.
“sella”, in Harry Thurston Peck, editor (1898), Harper's Dictionary of Classical Antiquities, New York: Harper & Brothers
“sella”, in William Smith et al., editor (1890), A Dictionary of Greek and Roman Antiquities, London: William Wayte. G. E. Marindin
From Arabicصَلَّى(ṣallā, “to pray”, also “to pray for somebody, to bless”). Regarding the e-vocalism and the verbal noun tislija there may have been a merger with Arabic سَلَّى(sallā, “to amuse, entertain, comfort”). See the doublet salla for more.