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-ostosis
ostracize
ostracod
ostracoderm
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ostrich
Ostrogoth
Ostyak
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Oswego tea
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ostiary

os·ti·ar·y [ óstee èrree ] (plural os·ti·ar·ies)


noun 
Definition:
 
doorkeeper in Roman Catholic church: a doorkeeper in a Roman Catholic church

[15th century. < Latin ostiarius "doorkeeper" < ostium "opening"]
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