LSJ
or ἀπομαγδαλιά, ἡ, (< ἀπομάσσω) the crumb or inside of the loaf, on which the Greeks wiped their hands at dinner, and then threw it to the dogs; hence, dog΄s meat, Ar. Eq. 415, Alciphr. 3.44, Plu. Lyc. 12.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)