twin

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twin

1. 
a. either of two persons or animals conceived at the same time
b. (as modifier): a twin brother
2. a crystal consisting of two parts each of which has a definite orientation to the other
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

twin

[′twin]
(biology)
One of two individuals born at the same time.
(crystallography)
twin crystal
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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References in periodicals archive ?
Unidentified vanishing twin pregnancies can also lead to foetal sex prediction errors if the vanishing twin is male and the remaining twin is female.
Natera's Panorama prenatal screening test identifies vanishing twins, tripology, study shows
This method is able to detect a "vanishing twin" phenomenon earlier than ultrasounds imaging of the embryonic heart.
Ggenotyping analysis of circulating fetal cells reveals high frequency of vanishing twin following transfer of multiple embryos
Washington, July 6 (ANI): The "vanishing twin" phenomenon, in which only one child is born from a pregnancy that originally starts as a multiple pregnancy, is associated with a two-fold increase in the likelihood of congenital malformations such as heart and skeletal defects and cerebral palsy in the remaining foetus, and nearly three-fold risk of multiple defects, a new research has revealed.
'Vanishing twin' ups risk of birth defects in surviving baby by three-fold
* The second blood population in my system is the result of a vanishing twin.
Doping
Other researchers have suggested that the bleeding may result from poor implantation or may be caused by a "vanishing twin"--the intrauterine demise of any additional embryos.
First-trimester bleeding in ART tied to poor prognosis
What is certain is that many more twins are conceived than are actually born; the so-called 'vanishing twin' syndrome.
The size of a rice grain, but inside a heart beats to the rhythm of life; THE HUMAN BODY THE EARLY EMBRYO

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