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diatom (plural diatoms)
- Any of a group of minute unicellular algae having a siliceous covering of great delicacy, now categorized as class Diatomophyceae or division Bacillariophyta.
- 2012, Caspar Henderson, The Book of Barely Imagined Beings, 2013 edition, Granta Books, page 287:
- Diatoms are characterized by a cell wall called a fistula made of silica, which usually has two overlapping sections.
grouping of minute algae