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Dictionary » T » Twin



1. Being one of two born at a birth; as, a twin brother or sister.

2. Being one of a pair much resembling one another; standing the relation of a twin to something else; often followed by to or with.

3. (Science: botany) double; consisting of two similar and corresponding parts.

4. (Science: chemistry) Composed of parts united according to some definite law of twinning. See Twin. Twin boat, or Twin ship, a vessel whose deck and upper works rest on two parallel hulls. Twin crystal. See Twin.

(Science: botany) Twin flower, a delicate evergreen plant (linnaea borealis) of northern climates, which has pretty, fragrant, pendulous flowers borne in pairs on a slender stalk. Twin-screw steamer, a steam vessel propelled by two screws, one on either side of the plane of the keel.

Origin: OE. Twin double, AS. Getwinne two and two, pl, twins; akin to D. Tweeling a twin, G. Zwilling, OHG. Zwiniling, Icel. Tvennr, tvinnr, two and two, twin, and to AS. Twi- two. See Twice, Two.

1. One of two produced at a birth, especially by an animal that ordinarily brings forth but one at a birth; used chiefly in the plural, and applied to the young of beasts as well as to human young.

2. (Science: astronomy) A sign and constellation of the zodiac; gemini. See Gemini.

3. A person or thing that closely resembles another. b5f 4. (Science: chemistry) A compound crystal composed of two or more crystals, or parts of crystals, in reversed position with reference to each other.

The relative position of the parts of a twin may be explained by supposing one part to be revolved 180 deg about a certain axis (called the twinning axis), this axis being normal to a plane (called the twinning plane) which is usually one of the fundamental planes of the crystal. This revolution brings the two parts into parallel position, or vice versa. A contact twin is one in which the parts are united by a plane surface, called the composition face, which is usually the same as the twinning plane. A penetration twin is one in which the parts interpenetrate each other, often very irregularly. Twins are also called, according to form, cruciform, geniculated, etc.

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Results from our forum

Brain size=IQ level theory (Blacks vs Whites & Asians)

... article's mention of genetic "multipliers" challenged my previous understanding of genetic influences (denoted by A in the twin study ACE model). If skin color is a determiner of IQ and skin color is genetic, that would be counted as a genetic influence on IQ in a twin study.

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by wildfunguy
Thu Mar 13, 2014 11:34 pm
Forum: Human Biology
Topic: Brain size=IQ level theory (Blacks vs Whites & Asians)
Replies: 68
Views: 219166

Re: Is complexity inevitable?

... Now it's time to get speculative! Be critical! Throw grains of salt in my eyes! Twin studies reveal that genetic differences can't explain all of the human variation, meaning that each unique genome presents a spectrum of possibilities, ...

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by wildfunguy
Thu Sep 26, 2013 6:12 pm
Forum: Evolution
Topic: Is complexity inevitable?
Replies: 16
Views: 4693


... on the 2-year-old girl. (See Daily Mail article with photos.) The girl was joined at the pelvis to what was, in effect, a headless, undeveloped twin. If it suited diehard evolutionists' purposes, some would surely say this unfortunate 8-limbed girl was evidence that humans evolved from spiders. ...

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by Sumanth001
Tue Aug 20, 2013 6:40 am
Forum: Human Biology
Topic: Atavism
Replies: 4
Views: 1240

Re: mutations and dependencies

... for this reason we should expect very many, if not most, mutations to result in lethal factors …” (Muller, H. J. (1918) “Genetic variability, twin hybrids and constant hybrids, in a case of balanced lethal factors.” Genetics 3:422-499. [Free Text, Genetics Online] ) http://speciesdevblog.wordpress.com/2012/01/24/interlocking-complexity/ ...

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by wildfunguy
Sun Feb 17, 2013 8:33 pm
Forum: Evolution
Topic: mutations and dependencies
Replies: 29
Views: 14718

Can you think of an evolutionary reason for this?

Even then, the correlation between stress and early puberty does not imply causation. A twin test might help. If you had two twins separated at birth, one raised in a low stress environment, the other in a high stress environment, and the high stress twin reached puberty ...

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by Rap
Fri Sep 28, 2012 9:08 pm
Forum: Evolution
Topic: Can you think of an evolutionary reason for this?
Replies: 8
Views: 4427
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