twinning
 雙晶之形成


 twin·ning /ˈtwɪnɪŋ/ 名詞
 孿生,雙生


 Twin v. i. [imp. & p. p. Twinned p. pr. & vb. n. Twinning.]
 1. To bring forth twins.
 2. To be born at the same birth.


 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.
 Polysynthetic twinning, repeated twinning of crystal lamellae, 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.

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 twin
      adj 1: being two identical [syn: duplicate, matching, twin(a),
              twinned]
      2: very similar [syn: siamese]
      n 1: either of two offspring born at the same time from the same
           pregnancy
      2: (astrology) a person who is born while the sun in in Gemini
         [syn: Gemini]
      3: a waterfall in the Snake River in southern Idaho [syn: {Twin
         Falls]
      4: a duplicate copy [syn: counterpart, similitude]
      v 1: duplicate or match; "The polished surface twinned his face
           and chest in reverse" [syn: duplicate, parallel]
      2: bring two objects, ideas, or people together; "This fact is
         coupled to the other one"; "Matchmaker, can you match my
         daughter with a nice young man?"; "The student was paired
         with a partner for collaboration on the project" [syn: match,
          mate, couple, pair]
      3: grow as twins; "twin crystals"
      4: give birth to twins
      [also: twinning, twinned]


 twinning
      adj : producing two offspring at a time [syn: biparous]


 twinning
      See twin