Definitions of protoctist
  1. noun
    any of the unicellular protists
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    protozoan, protozoon
    any of diverse minute acellular or unicellular organisms usually nonphotosynthetic
    alga, algae
    primitive chlorophyll-containing mainly aquatic eukaryotic organisms lacking true stems and roots and leaves
    sarcodine, sarcodinian
    protozoa that move and capture food by forming pseudopods
    rhizopod, rhizopodan
    protozoa characterized by a pseudopod
    an amoeba-like protozoan with a chitinous shell resembling an umbrella
    a protozoan with an ovoid shell of cemented sand grains
    ciliate, ciliated protozoan, ciliophoran
    a protozoan with a microscopic appendage extending from the surface of the cell
    plant growing in the sea, especially marine algae
    golden algae
    algae having the pigments chlorophyll and carotene and xanthophyll
    yellow-green algae
    any alga of the division Chrysophyta with its chlorophyll masked by yellow pigment
    microscopic unicellular marine or freshwater colonial alga having cell walls impregnated with silica
    confervoid algae
    algae resembling confervae especially in having branching filaments
    brown algae
    algae having the chlorophyll masked by brown and yellow pigments
    minute single-celled green freshwater organism having a single flagella; often classed as algae
    euglenid, euglenoid, euglenophyte
    marine and freshwater green or colorless flagellate organism
    chlorophyte, green algae
    algae that are clear green in color; often growing on wet ricks or damp wood or the surface of stagnant water
    any alga of the genus Chlorella
    red algae
    marine algae in which the chlorophyll is masked by a red or purplish pigment; source of agar and carrageenan
    flagellate, flagellate protozoan, flagellated protozoan, mastigophoran, mastigophore
    a usually nonphotosynthetic free-living protozoan with whiplike appendages; some are pathogens of humans and other animals
    plantlike flagellate
    unicellular organisms having many characteristics of typical algae
    cryptomonad, cryptophyte
    common in fresh and salt water appearing along the shore as algal blooms
    parasitic spore-forming protozoan
    type of:
    micro-organism, microorganism
    any organism of microscopic size
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