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ränivetikaid kattev ränist kest, mis koosneb kahest üksteise sisse Petri tassina mahtuvast poolmest
the siliceous skeleton of a diatom, consisting of two halves (the epivalve and the hypovalve). It is omate, microscopic, and boxlike
frustule . EKI terminibaas Esterm. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//esterm/frustule/1/eng (10.07.2026)