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|Noun||1.||class Diatomophyceae - marine and freshwater eukaryotic algae: diatoms|
Chrysophyta, division Chrysophyta - mostly freshwater eukaryotic algae having the chlorophyll masked by brown or yellow pigment; yellow-green and golden-brown algae and diatoms: Xanthophyceae, Chrysophyceae, Bacillariophyceae; some classification systems superseded or subsumed by Heterokontophyta
diatom - microscopic unicellular marine or freshwater colonial alga having cell walls impregnated with silica
class - (biology) a taxonomic group containing one or more orders