[os-tee-uh; Italian aw-styah] /ˈɒs ti ə; Italian ˈɔ styɑ/

a town in central Italy, SW of Rome: ruins from 4th century b.c.; site of ancient port of Rome.
[os-tee-uh m] /ˈɒs ti əm/
noun, plural ostia
[os-tee-uh] /ˈɒs ti ə/ (Show IPA)
Anatomy, Zoology. a small opening or orifice, as at the end of the oviduct.
Zoology. one of the tiny holes in the body of a sponge.
an ancient town in W central Italy, originally at the mouth of the Tiber but now about 6 km (4 miles) inland: served as the port of ancient Rome; harbours built by Claudius and Trajan; ruins excavated since 1854
noun (biology) (pl) -tia (-tɪə)
any of the pores in sponges through which water enters the body
any of the openings in the heart of an arthropod through which blood enters
any similar opening

ostium os·ti·um (ŏs’tē-əm)
n. pl. os·ti·a (-tē-ə)
A small opening or orifice, as in a body organ.
os’ti·al adj.


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    [os-tee-ak] /ˈɒs tiˌæk/ noun 1. . [os-tee-ak] /ˈɒs tiˌæk/ noun, plural Ostyaks (especially collectively) Ostyak. 1. . /ˈɒstɪˌæk/ noun 1. (pl) -aks, -ak. a member of an Ugrian people living in NW Siberia E of the Urals 2. the language of this people, belonging to the Finno-Ugric family: related to Hungarian

  • Ostiary

    [os-tee-er-ee] /ˈɒs tiˌɛr i/ noun, plural ostiaries. 1. Also called doorkeeper, porter. Roman Catholic Church. 2. a doorkeeper, as of a church. /ˈɒstɪərɪ/ noun (pl) -aries 1. (RC Church) another word for porter2 (sense 4)

  • Ostiole

    [os-tee-ohl] /ˈɒs tiˌoʊl/ noun 1. Biology. a small opening or pore, especially in the fruiting body of a fungus. /ˈɒstɪˌəʊl/ noun (biology) 1. the pore in the reproductive bodies of certain algae and fungi through which spores pass 2. any small pore

  • Ostinato

    [os-ti-nah-toh; Italian aws-tee-nah-taw] /ˌɒs tɪˈnɑ toʊ; Italian ˌɔs tiˈnɑ tɔ/ noun, plural ostinatos. Music. 1. a constantly recurring melodic fragment. /ˌɒstɪˈnɑːtəʊ/ noun 1. 1876, from Italian ostinato, literally “obstinate, persistent.”

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