We found 4 definitions of protoctist from 3 different sources.
NounPlural: protoctists |
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protoctist - any of the unicellular protists | ||
micro-organism, microorganism any organism of microscopic size | ||
kingdom protoctista, 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 | ||
protozoan, protozoon any of diverse minute acellular or unicellular organisms usually nonphotosynthetic |