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)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
"Monoamniotic twin pregnancies are at extremely high risk of intrauterine death before 28 weeks' gestation," Dr.
At the time of the births, Emma said: "It's been hard when you know so many monoamniotic twins don't make it.
Incredibly, a consultant then told Karen that she could give birth naturally, despite the fact that monoamniotic twins are nearly always delivered by Caesarian because of the danger of further cord entanglement.
If split occurs between 8th-13th day monochorionic monoamniotic twins results which is a rare occurrence and accounts for 1-2% of monozygotic twins.
This and other evidence suggests that mothers of monoamniotic twins have the best possible outcome when their pregnancies are managed in a hospital setting with fetal monitoring two to three times a day, starting at 24-26 weeks' gestation, with delivery timed between 32 and 34 weeks' gestation.
Emma Canning, aged 36, had Christmas babies Hannah and Sophie, who were monoamniotic twins - sharing the same birth sac and placenta.
It is a rare complication of monoamniotic twins. It affects about 1% of monozygotic twins.
Five entities--umbilical cord entanglement with monoamniotic twins, velamentous cord insertion, funic presentation, oligohydramnios, and a noncoiled cord--are responsible for almost all cases.