desmid
Concise Oxford English Dictionary © 2008 Oxford University Press:
desmid /ˈdɛzmɪd/
▶noun Biology a single-celled freshwater alga which appears to be composed of two rigid cells with a shared nucleus. [Family Desmidiaceae .]
– origin C19: from mod. L. Desmidium (genus name), from Gk desmos ‘band, chain’ (because the algae are often found united in chains or masses).
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