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ostium
‖ ostium (ˈɒstɪəm) Pl. ostia. [L. ostium door, entrance, mouth of a river.] † 1. The mouth of a river. Obs.1665 Sir T. Herbert Trav. (1677) 89 The great and noble River Ganges in two Ostiums falls under 23 deg. 1695 Woodward Nat. Hist. Earth i. 43 Mud being reposed..near the Ostia of those Rivers. 2...
Oxford English Dictionary
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Ostium
Ostium or ostia may refer to:
Human anatomy
Ostium of fallopian tube
Ostium of the uterus (disambiguation)
Ostium primum of the developing heart
Ostium secundum (foramen ovale) of the developing heart
Ostium maxillare of the maxillary sinus
Ostium vaginae (vaginal orifice)
Coronary ostium – opening
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Ostium: insects circulatory system  near the end of the heart.
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Septum primum
Development
The gap below it is known as the ostium primum (), and becomes increasingly small. The septum primum eventually fuses with the endocardial cushion, closing the ostium primum off completely.
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Tactusa ostium
Tactusa ostium is a moth of the family Erebidae first described by Michael Fibiger in 2010. It is known from Thailand.
The wingspan is about 11 mm.
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ostial
ostial, a. Anat. (ˈɒstɪəl) [f. ostium + -al.] Of, pertaining to, or having an ostium or ostia; of the nature of an ostium (in an insect's heart).1900 Miall & Hammond Struct. & Life Hist. Harlequin Fly 76 All the valves found in the heart of any Chironomus, whether cellular, ostial, or aortic, appear...
Oxford English Dictionary
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Ostiole
The word is a diminutive of "ostium", "opening". See also
Ostium (disambiguation)
References
Fungal morphology and anatomy
Plant anatomy
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ostiate
ostiate, a. rare. (ˈɒstɪeɪt) [f. ostium + -ate2.] = ostial a.1897 Natural Sci. Apr. 266 The parapodial jaws and the ostiate heart cannot be supposed to have been both developed independently in each group of arthropods.
Oxford English Dictionary
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Foramen secundum
The foramen secundum, or ostium secundum is a in the septum primum, a precursor to the interatrial septum of the human heart. This method avoids the symptoms that accompany most ostium secundum atrial septal defects.
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Ostia
Theobald of Ostia (died 1188), Catholic bishop
Aurea of Ostia (died mid-3rd century), patron saint of Ostia
Other
Bishop of Ostia
The plural form of ostium , an anatomical term meaning a small opening
The plural form of ostium (sponges), a pore present in sponges
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Ostial disease
Ostial disease, namely coronary ostial stenosis, is the occlusion of coronary ostium.
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Foramen ovale (heart)
As the septum primum grows, the ostium primum narrows and eventually closes. The ostium secundum provides communication between the atria after the ostium primum closes completely.
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Oidaematophorus vafradactylus
Description
The female ostium is positioned in the center of genitalia, and deeply excavated.
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Maxillary hiatus
The maxillary hiatus (also known as maxillary sinus ostium, maxillary ostium, or opening from the maxillary sinus) is the opening of a maxillary sinus
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Interatrial septum
As the septum primum grows, the ostium primum progressively narrows. Before the ostium primum is completely occluded, a second opening called the ostium secundum begins to form in the septum primum.
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