Twinning

From Free net encyclopedia

Twinning (making a twin of) has at least five meanings:

• In biology and agriculture, producing two offspring (i.e., twins) at a time, or having a tendency to do so
• City and town twinning
• Widening of a road by construction of another one next to it, with a median in between (Canada)
• Crystal twinning in crystallography refers to intergrown crystal forms which display a twin boundary: Crystal habit
• "Twinning" is a jargon term in motion pictures for various special effects that allow to double (or multiply) the presence of the same actor or actress on screen.

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