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WordNet-Online 
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| Definitions from the WebExternal Os-CervixDefinition: The external os, also known as the cervix, is the lower part of the uterus that connects to the vagina. Senses/Usages: 
 Example Sentence: The doctor performed a cervical examination and noted that the external os was dilating, indicating the start of labor. Related Products: | ||||
| external iliac vein external jugular vein external maxillary artery external memory device external nasal vein external oblique muscle external organ external orifice external os-cervix external otitis external pressure external respiration external storage external viewpoints externalisation externalise externalities 
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