Noun protoctista has 1 sense

• protoctista(n = noun.animal) kingdom protoctista - in most modern classifications, replacement for the Protista; includes: Protozoa; Euglenophyta; Chlorophyta; Cryptophyta; Heterokontophyta; Rhodophyta; unicellular protists and their descendant multicellular organisms: regarded as distinct from plants and animals; Array
is a kind of kingdom