Same entry in ps.-Zonaras and, according to Adler, the Ambrosian Lexicon.
The translation of the headword given above is the only sense of this feminine noun recognised in LSJ s.v.; the glossing noun, however, has several meanings including 'curvature', so it is possible that the headword here actually means the shape of the vehicle's chassis.
cf. generally delta 1292, delta 1293, delta 1294, delta 1295.