Twinning axis

Twinning axis
Twinning Twin"ning, n. (Crystallog.) 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. [1913 Webster]

{Polysynthetic twinning}, repeated twinning of crystal lamell[ae], as that of the triclinic feldspars.

{Repeated twinning}, twinning of more than two crystals, or parts of crystals.

{Twinning axis}, {Twinning plane}. See the Note under {Twin}, n. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

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  • Twinning — Twin ning, n. (Crystallog.) 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… …   The Collaborative International Dictionary of English

  • Twinning plane — Twinning Twin ning, n. (Crystallog.) 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… …   The Collaborative International Dictionary of English

  • twinning — /twin ing/, n. 1. the bearing of two children at one birth. 2. the coupling of two persons or things; union. 3. Crystall. the union of crystals to form a twin. [1565 75; TWIN1 + ING1] * * * ▪ crystallography       in crystallography, regular… …   Universalium

  • Polysynthetic twinning — Twinning Twin ning, n. (Crystallog.) 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… …   The Collaborative International Dictionary of English

  • Repeated twinning — Twinning Twin ning, n. (Crystallog.) 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… …   The Collaborative International Dictionary of English

  • Twin — Twin, n. 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. [1913 Webster] 2. pl. (Astron.) A sign… …   The Collaborative International Dictionary of English

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