Lewis Short
(adverb) : frustātim, frustum
* Piecemeal, in pieces (very rare): objectare leonibus prandium, Pompon. ap. Non. 113, 7: coquitur in olla, aut frustatim in patinis,Plin. 20, 9, 39, § 99; Prud. Psych. 720.
Charlton T. Lewis, Charles Short, A Latin Dictionary