The boundary or the rope.
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∙ 2008-12-17 07:22:00The outer edge of a plant cell is called the cell wall
The outer edge of a circle is called the circumference.
The out edge of a cup is called the 'Rim'.
brim
A delmer
circumference
Limb
Onion skin.
Cell membrane
A straight line from the center of a circle to the outer edge is called a radius.
Cell membrane
the outer edge of the cytoplasm is the cell membrane.