ostiary

noun

os·​ti·​ary

ˈästēˌerē

plural -es

1

: doorkeeper

2

obsolete : a mouth of a river

Word History

Etymology

Latin ostiarius, from ostium door, mouth of a river + -arius -ary

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

• More than 250,000 words that aren't in our free dictionary
• Expanded definitions, etymologies, and usage notes
• Advanced search features
• Ad free!