Lewis & Short

baxĕa and baxa, ae, f. [πάξ = ὑπόδημα εὐυπόδητον, Hesych.], a kind of woven shoe worn on the comic stage and by philosophers (only ante- and post-class. and rare), Plaut. Men. 2, 3, 40; App. M. 2, p. 127, 6; 11, p. 260, 39; Flor. n. 9.
In sing., Tert. Idol. 8; Pall. 4; cf. Isid. Orig. 19, 34, 6 and 13.