sellŭla, ae, f. dim. [sella],
a little seat or stool; also, a sedan (post-Aug.; but cf. sellularius), Arn. 2, 23; Tac. H. 3, 84; Fronto Ep. ad M. Caes. 5, 44.
sellula ae, f dim.sella, a little sedan chair , Ta. ...
An Elementary Latin Dictionary