Definition of Protoctista in English:

Protoctista

plural noun

Biology
  • A kingdom or large grouping that is either synonymous with the Protista or equivalent to the Protista together with their multicellular descendants.

    • ‘This section covers almost exclusively single-celled forms, i.e. the Protista or Protoctista.’
    • ‘He says there are twenty or more kingdoms hidden in the Protoctista gloss.’

Origin

Modern Latin (plural), based on Greek prōtos first.

Pronunciation:

Protoctista

/ˌprəʊtɒkˈtɪstə/