ex-dorsŭo — Lewis & Short
ex-dorsŭo or -dorso, āre, v. a.dorsum; lit., to deprive of the back; hence, in partic., of fishes,
I to take out the backbone, to bone (ante- and post-class.):
congrum, muraenam exdorsua, quantum potes,Plaut. Aul. 2, 9, 2:
pisces (with desquamare),App. Mag. p. 301, 3; cf.:
exdorsuare, dorso nudare,Non. 17, 29: exdorsua dorsum confringe; alii, exime, Paul. ex Fest. p. 79, 12 Müll.