Definition of twinned in English:

twinned

Syllabification: twinned
Pronunciation: /twind
 
/

adjective

(Of a crystal) that is a composite consisting of two (or sometimes more) parts that are reversed in orientation with respect to each other (typically by reflection in a particular plane).
More example sentences
  • When viewed in thin section, it is clear that the ‘massive’ material is composed of an intergrowth of complexly twinned crystals.
  • A variety of large twinned crystal forms of gypsum grow on the floors of evaporating lagoons and lakes including fans and needles.
  • Although the quartz encrustation protects the calcite from dissolving, it obscures the twinned nature of the crystals, which is revealed by mechanical removal of the crust.

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