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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


One of two individuals born at the same time.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

digital twin

(1) A digital representation of a person. A digital twin is more realistic than an avatar, which is typically a cartoon-like character. See avatar.

(2) A digital representation of a real-world object. For example, a computer-aided design (CAD) drawing of a part or product is its digital twin. See CAD.

(3) A real-time representation of an industrial device. A digital twin is more than just a control panel that monitors a sensor or machine. It is a graphical replica of the specific device as it is performing in real time, and adjustments can be simulated on the twin to determine their effect before they are implemented in the field. See IoT.
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References in periodicals archive ?
Concordance for DS appears to be even less common among dizygotic twin gestations with only a few cases reported with confirmatory laboratory testing [2,6,13-17].
Also, RS+ gene is present in approximately 80% of the population, in which are included the monozygotic and, also, dizygotic twins.
Dizygotic (from two different eggs) viz non-identical twins.
Dizygotic twins, in contrast, show a 0 to 10% concordance under the same models (Folstein & Rutter, 1977; Folstein & Rosen-Sheidley, 2001).
Using this information, we assigned twin births as monozygotic (reporting a twin sister who is genetically identical to the participant based on perception or testing), dizygotic (reporting a twin brother or a twin sister who is not genetically identical to the participant), or unknown (missing data to categorize type of twin birth).
The genotype of dizygotic twins of the same gender is 50% identical.
Results revealed that the average of the intraclass correlations across six major interests factors (factors similar to Holland's (1985) RIASEC types-practical, science, business, clerical, helping, and artistic) was .48 for identical twins (monozygotic) reared together and .30 for fraternal twins (dizygotic).
Third, data from twin studies show significantly greater concordance in myopia rates among monozygotic compared to dizygotic twins.19 Finally, genetic studies have identified several loci for certain pathological variants of myopia.20
This technique involves the amplification of highly polymorphic regions specific for each chromosome, such as short tandem repeat sequences (STRs), to identify different allelic forms in individuals and confirm whether they are monozygotic or dizygotic. In this case, the QF-PCR assay confirmed that the twins were monozygous (MZ).
Twin studies are conducted with equal numbers of both monozygotic and dizygotic twins.
The study included identical (monozygotic) and fraternal (dizygotic) twins.