A single-celled freshwater alga of the order Desmidiales, or a scientist who studies these organisms.
From 'desmid' + suffix '-ian' (person or thing associated with). Can refer either to the organism itself or the person studying it, like 'botanist' from 'botany'.
A desmidian can mean both the algae and the scientist—it's one of those clever words where the same name works for the creature and the person obsessed with studying it!
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