-orium

From Latin -ōrium, -tōrium.

• (Received Pronunciation) IPA^(key): /ˈɔːɹɪəm/

-orium (plural -oriums or -oria)

1. forming nouns denoting a place for a particular function.
   • 1933 July 9, Ellis Parker Butler, “Enough Is Sufficient”, in Los Angeles Times, volume LII, page 6, columns 2–3:

     “It’s a pickle jar,” said Alice. “It’s one of the new kind called a pickelorium.”

From rebracketing of -tōrium or alteration of -ārium, perhaps also influenced in some cases by the abstract noun suffix -or (as in sūdōrium, a medieval alternative form of sūdārium, from sūdor).

• (Classical Latin) IPA^(key): [oː.ri.ũː]
• (modern Italianate Ecclesiastical) IPA^(key): [o.ri.um]

-ōrium n (genitive -ōriī); second declension (Medieval Latin)

1. Suffix forming nouns, usually denoting places or objects

   lavō (“to wash, bathe”) → lavōrium (“washroom, wash basin”) (also lavārium)

   servō (“to preserve, reserve”) → servōrium (“fish pond, fish tank”) (also servārium, servātōrium)

   ferveō (“to boil”) and fervor (“boiling heat”) → fervōrium (“cauldron”)

Second-declension noun (neuter).