Definition of protoplast in English:

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Pronunciation: /ˈprəʊtə(ʊ)plast/
Pronunciation: /ˈprəʊtə(ʊ)plɑːst/


chiefly Botany
The protoplasm of a living plant or bacterial cell whose cell wall has been removed.
Example sentences
  • In this plasmolysed cell the protoplast has suffered very intense shrinkage.
  • Fibres are often described as cells having no living protoplasts at maturity.
  • The hydrostatic pressure model proposes that statocytes detect the total weight exerted by the protoplast on its cell wall.


Late 19th century: from Greek prōtoplastos 'first formed', from prōtos 'first' + plassein 'to mould'.

For editors and proofreaders

Line breaks: proto|plast

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