| 单词 | protoctist |
| 释义 | protoctist (extremely rare) n WORD FAMILY protoctist USAGE EXAMPLESProtoctist and fungal individuals can grow and reproduce without any sexual partners. Scientific American(Nov 23, 2011) Sex began when unfavorable seasonal changes in the environment caused our protoctist predecessors to engage in attempts at cannibalism that were only partially successful. Scientific American(Nov 23, 2011) Like our protoctist ancestors that evolved from symbioses among bacteria, kefir individuals arose from the physical association of 30 different kinds of microbes. Scientific American(Nov 23, 2011) n any of the unicellular protists Hypo|Hyper protozoan, protozoon any of diverse minute acellular or unicellular organisms usually nonphotosynthetic alga, algaeprimitive chlorophyll-containing mainly aquatic eukaryotic organisms lacking true stems and roots and leaves sarcodine, sarcodinianprotozoa that move and capture food by forming pseudopods rhizopod, rhizopodanprotozoa characterized by a pseudopod arcellaan amoeba-like protozoan with a chitinous shell resembling an umbrella difflugiaa protozoan with an ovoid shell of cemented sand grains ciliate, ciliated protozoan, ciliophorana protozoan with a microscopic appendage extending from the surface of the cell seaweedplant growing in the sea, especially marine algae golden algaealgae having the pigments chlorophyll and carotene and xanthophyll yellow-green algaeany alga of the division Chrysophyta with its chlorophyll masked by yellow pigment diatommicroscopic unicellular marine or freshwater colonial alga having cell walls impregnated with silica confervoid algaealgae resembling confervae especially in having branching filaments brown algaealgae having the chlorophyll masked by brown and yellow pigments euglenaminute single-celled green freshwater organism having a single flagella; often classed as algae euglenid, euglenoid, euglenophytemarine and freshwater green or colorless flagellate organism chlorophyte, green algaealgae that are clear green in color; often growing on wet ricks or damp wood or the surface of stagnant water chlorellaany alga of the genus Chlorella red algaemarine algae in which the chlorophyll is masked by a red or purplish pigment; source of agar and carrageenan flagellate, flagellate protozoan, flagellated protozoan, mastigophoran, mastigophorea usually nonphotosynthetic free-living protozoan with whiplike appendages; some are pathogens of humans and other animals plantlike flagellateunicellular organisms having many characteristics of typical algae cryptomonad, cryptophytecommon in fresh and salt water appearing along the shore as algal blooms sporozoanparasitic spore-forming protozoan micro-organism, microorganism any organism of microscopic size |
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