
1) Biparous 2) Multiparous 3) Type of road 4) Union
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https://www.crosswordclues.com/clue/twinning

1) Biparous 2) Multiparous
Found on
https://www.crosswordclues.com/clue/twinning
[roads] Twinning a road involves the construction of a similar or identical parallel road. It is usually done when an existing highway requires a significant increase in capacity. Twinning is frequently advantageous because it allows traffic capacity to be doubled and produces a dual carriageway with separation between traffic directions, w...
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http://en.wikipedia.org/wiki/Twinning_(roads)

• (n.) The assemblage of two or more crystals, or parts of crystals, in reversed position with reference to each other in accordance with some definite law; also, rarely, in artificial twinning (accomplished for example by pressure), the process by which this reversal is brought about. • (p. pr. & vb. n.) of TwinTwinning: words in the def...
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http://thinkexist.com/dictionary/meaning/twinning/

(from the article `multiple birth`) Twinning refers to the process that leads to the production of more than one offspring at one birth. In humans the most frequent type of twinning ...
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http://www.britannica.com/eb/a-z/t/97

in crystallography, regular intergrowth of two or more crystal grains so that each grain is a reflected image of its neighbour or is rotated with ... [5 related articles]
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http://www.britannica.com/eb/a-z/t/97

<chemistry> The assemblage of two or more crystals, or parts of crystals, in reversed position with reference to each other in accordance with some definite law; also, rarely, in artificial twinning (accomplished for example by pressure), the process by which this reversal is brought about. Polysynthetic twinning, repeated twinning of crystal...
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http://www.encyclo.co.uk/local/20973

(twin´ing) the production of symmetrical structures or parts by division. the simultaneous production of two or more offspring; see twin.
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http://www.encyclo.co.uk/local/21001

Tendency of some crystals to intergrow in a distinct way or form specific, repeated patterns. See penetration twinning, repeated twinning, and contact twinning. ^top
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http://www.encyclo.co.uk/local/22290

Type: Term Pronunciation: twin′ing Definitions: 1. Production of equivalent structures by division; the tendency of divided parts to assume symmetric relations.
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http://www.medilexicon.com/medicaldictionary.php?t=95214

A twinned crystal is made up of two or four parts. One of its parts is in a reversed orientation to the adjacent part. Twins are recognised by the presence of re-entrant angles (angles that point inwards) Twinning can occur simply by contact across a flat surface, forming contact 'twins'. An example of this is rutile. In other cases, the twin canno...
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https://www.encyclo.co.uk/local/20501

the bearing of two children at one birth. · the coupling of two persons or things; union. · the union of crystals to form a twin.
Found on
https://www.infoplease.com/dictionary/twinning
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