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cell membrane
[ sel mem-breyn ]
noun
, Biology.
- the semipermeable membrane enclosing the cytoplasm of a cell.
cell membrane
noun
- a very thin membrane, composed of lipids and protein, that surrounds the cytoplasm of a cell and controls the passage of substances into and out of the cell Also calledplasmalemmaplasma membrane
cell membrane
- The thin membrane that forms the outer surface of the protoplasm of a cell and regulates the passage of materials in and out of the cell. It is made up of proteins and lipids and often contains molecular receptors. The membranes of organelles within the cell are made of the same basic material as the cell membrane. In plant cells, the cell membrane is surrounded by a rigid cell wall.
- Also called plasma membrane
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Word History and Origins
Origin of cell membrane1
First recorded in 1865–70
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Example Sentences
No breathing organs are seen, because osmosis of oxygen and carbon dioxide may take place anywhere through the cell membrane.
From Project Gutenberg
Meanwhile great advances had been made also in the knowledge of the mature framework of cell-membrane in plants.
From Project Gutenberg
They consist of a minute droplet of protoplasm (mycroprotein) surrounded by a delicate cell membrane.
From Project Gutenberg
The outer covering, or cell membrane, of the globular egg remains undivided.
From Project Gutenberg
We may also obtain cells with cytoplasm filling the whole of the cellular cavity or separated from the cell-membrane.
From Project Gutenberg
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