Lewis Short
(adverb) : frustillātim, frustillum
* In small pieces, in little bits (ante-class.): nisi mihi virgo redditur, Jam ego te faciam ut hic formicae frustillatim differant,Plaut. Curc. 4, 4, 20; Poët. ap. Non. 112, 8.
Charlton T. Lewis, Charles Short, A Latin Dictionary