Lewis & Short

faenĕus (fēn-, foen-), a, um, adj. [faenum, I.],

  1. I. of hay (very rare): homines faeneos in medium ad tentandum periculum projectos, men of hay, hay effigies, Cic. Fragm. Or. Cornel. 1, 1; cf.: simulacra effigie hominum ex faeno fieri solebant, quibus objectis ad spectaculum praebendum tauri irritarentur, Ascon. p. 62 ed. Orell.
  2. II. Fig.: faeneus ille Platonicus Antiochus, August. c. Acad. 3, 18.