diaetarius

• (with initial di-) diētārius
• (with initial z-) zaetārius, zētārius

From diaeta +‎ -ārius.

• (Classical) IPA^(key): /di.ae̯ˈtaː.ri.us/, [d̪iäe̯ˈt̪äːriʊs̠]
• (modern Italianate Ecclesiastical) IPA^(key): /di.eˈta.ri.us/, [d̪ieˈt̪äːrius]

diaetārius m (genitive diaetāriī or diaetārī); second declension

1. a slave responsible for room service, a valet-de-chambre
2. a cabin steward on a ship
3. (Late Latin) a slave or servant who serves at the dining table, a table waiter
4. (Medieval Latin, by misassociation with diēs, “a day”) a day-labourer

Second-declension noun.

¹Found in older Latin (until the Augustan Age).

• (valet-de-chambre): diaetarchēs

• Ancient Greek: δῐαιτᾱ́ρῐος (diaitā́rios)

• “dĭaetārĭus”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
• DIÆTARII in Charles du Fresne du Cange’s Glossarium Mediæ et Infimæ Latinitatis (augmented edition with additions by D. P. Carpenterius, Adelungius and others, edited by Léopold Favre, 1883–1887)
• dĭætārĭus in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette, page 517/3.
• “diaetārius” on page 535/3 of the Oxford Latin Dictionary (1st ed., 1968–82)
• Niermeyer, Jan Frederik (1976) “dietarius (subst.)”, in Mediae Latinitatis Lexicon Minus, Leiden, Boston: E. J. Brill, page 330/1