[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.
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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  • Ostium of uterus

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  • Ostium uterinum tubae

    ostium uterinum tubae ostium u·ter·i·num tu·bae (yōō’tə-rī’nəm tōō’bē, tyōō’bē) n. The uterine opening of the oviduct.

  • Ostler

    [os-ler] /ˈɒs lər/ noun 1. . /ˈɒslə/ noun 1. (archaic) a stableman, esp one at an inn n. late 14c., phonetic spelling of hostler.

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