noun🔗ShareKieselalgenAny of a group of minute unicellular algae having a siliceous covering of great delicacy, now categorized as class Diatomophyceae or division Bacillariophyta."Microscopic diatoms in the ocean produce a large portion of the Earth's oxygen. "Mikroskopische Kieselalgen im Ozean produzieren einen großen Teil des Sauerstoffs der Erde.organismbiologymicroorganismplantnatureenvironmentecologyscienceChat with AIVocabulary GamePractice Reading