1) anything eaten with bread
1a) spoken of fish boiled or broiled
Part of Speech: noun neuter
Neuter of a presumed derivative of a compound of G4314 and G5315; something eaten in addition to bread, that is, a relish (specifically fish; compare G3795): - meat.
These two sites give similar information, with the definition from several dictionaries and statistics on the use of the word.
Perseus Digital Library
University of Chicago's Logion lexicon
Thayer's dictionary plus other information.
From this site's dictionary (in Italian)
Click on the first column to search for that word as a form of the root προσφάγιον; click on the second column to search for that grammatical form of the root προσφάγιον; click on the third column to search for that word and grammatical form; click on the total to search for the root προσφάγιον.