Comparable entry, according to Adler, in the Ambrosian Lexicon (2125). In ps.-Zonaras 880.24 the same headword is glossed with deipnoklhto/rion, 'dinner-invitation'. Otherwise this -orei=on form is found only in grammarians. For the -o/rion form see e.g. Herodotus 4.35.4 (Ionic), Pausanias 5.15.12.
[1] Strictly speaking a trape/zion should be a "little table" (diminutive of tra/peza, tau 906), but in late Greek the distinction disappears. From its use as a gloss here it may be that the lexicographer is thinking that the term means "table-room", but that usage is not attested elsewhere.