umbilical cord

noun
1.
Anatomy. a cord or funicle connecting the embryo or fetus with the placenta of the mother and transporting nourishment from the mother and wastes from the fetus.
2.
any electrical, fuel, or other cable or connection for servicing, operating, or testing equipment, as in a rocket or missile, that is disconnected from the equipment at completion.
3.
Aerospace Slang. a strong lifeline by which an astronaut on a spacewalk is connected to the vehicle and supplied with air, a communication system, etc.

Origin:
1745–55; 1965–70 for def 2

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
umbilical cord
 
n
1.  the long flexible tubelike structure connecting a fetus with the placenta: it provides a means of metabolic interchange with the mother
2.  any flexible cord, tube, or cable used to transfer information, power, oxygen, etc, as between an astronaut walking in space and his spacecraft or a deep-sea diver and his craft

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

umbilical cord n.
The flexible cordlike structure connecting a fetus at the navel with the placenta and containing two umbilical arteries and one vein that transport nourishment to the fetus and remove its wastes. Also called funis.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
umbilical cord   (ŭm-bĭl'ĭ-kəl)  Pronunciation Key 
The flexible cord that attaches an embryo or fetus to the placenta. The umbilical cord contains blood vessels that supply nutrients and oxygen to the fetus and remove its wastes, including carbon dioxide.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary
umbilical cord [(um-bil-i-kuhl)]

A ropelike structure that connects a developing embryo or fetus to the placenta. The umbilical cord contains the blood vessels that supply the embryo or fetus with nutrients and remove waste products. Connected to the abdomen of the embryo or fetus, the umbilical cord is cut at birth, leaving a small depression — the navel, or “belly button.”

Note: The detaching of the umbilical cord provides a figure of speech for new independence: “He finally cut the umbilical cord and moved out of his parents' home.”
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

umbilical cord

narrow cord of tissue that connects a developing embryo, or fetus, with the placenta (the extra-embryonic tissues responsible for providing nourishment and other life-sustaining functions). In the human fetus, the umbilical cord arises at the belly and by the time of birth is about 2 feet (60 cm) long and 0.5 inch (1.3 cm) in diameter. It contains two umbilical arteries and one umbilical vein, through which the fetal heart pumps blood to and from the placenta, in which exchange of nutrient and waste materials with the circulatory system of the mother takes place. The umbilical vein carries blood oxygenated in the maternal body from the placenta to the fetus, while the umbilical arteries carry deoxygenated blood and fetal wastes from the fetus to the placenta, where they are treated in the maternal body. After birth, the umbilical cord is clamped or tied and is then cut. The stump of the cord that remains attached to the baby withers and falls off after a few days, leaving the circular depression in the abdomen known as the navel.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Some types can be derived from umbilical cord blood, adult bone marrow, or
  possibly even adult skin.
Instead, its umbilical cord is linked to blood vessels in a membrane attached
  to the egg's inner wall.
Scientists have found that umbilical cord blood may be a new source of
  organ-growing stem cells.
One of the best and non-controversial sources of stem cells remains umbilical
  cord blood.
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