1.Diatoms A phylum of the protoctista whose members are unicellular algae found in freshwater, the sea, and soil.
一类藻类植物。藻体一般为单细胞，有时集成群体。普遍分布于淡水，海水以及土壤中。
2.Algae (sing. alga ) A large mixed group of photosynthesizing eukaryotic organisms, now usually placed in the kingdom Protoctista.
一大类能够进行光合作用的真核生物，现在隶属于原生生物门。