Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The cytoplasmic membrane that surrounds a vacuole of a plant cell. Also called vacuolar membrane.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The cytoplasmic membrane surrounding a vacuole, separating the vacuolar contents from the cell's cytoplasm.

from The Century Dictionary and Cyclopedia

  • n. Ono of the vacuoles of the plant-cell, having a distinct wall and dividing like a true cellular organ, such as a chromosome, chromatophore, etc. Went (1888).

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

Greek tonos, string, tension; see ten- in Indo-European roots + -plast.

Examples

  • Most cells can have small cell wall cell membrane vacuoles that are formed as required, but plant cells usually have one cytoplasm tonoplast very large permanent vacuole that fills most of the cell, so that the membrane permanent cytoplasm (and everything else) forms a thin layer round the outside. valuole nucleus Plant cell vacuoles are filled with cell sap, and are very important in keeping the cell rigid, or turgid.

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