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tone poem
tone row
tone up
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tonoplast

to·no·plast [ tṓnə plàst ] (plural to·no·plasts)


noun 
Definition:
 
separating membrane in plant cell: the semipermeable membrane separating a fluid-filled internal cavity vacuole from the surrounding cytoplasm inside a plant cell

[Late 19th century. < Greek tonos "tension, tone"]
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