: any of numerous unicellular or colonial green algae (order Zygnematales, especially family Desmidiaceae)
Illustration of desmid
Word History
Etymology
from the stem of New Latin Desmidiaceae, family name (as if ending in -id entry 1), from Desmidium, genus name (from Greek desmós "something that ties or attaches, (in plural) bonds, chain" —from déō, deîn "to bind, tie" + -smos, noun suffix— + -idion, diminutive suffix) + -aceae -aceae — more at diadem
Note: The taxonomic literature credits the description of the genus Desmidium to the English botanist John Ralfs (1807-90), in The British Desmidieæ (London, 1848), p. 61. Ralfs took the name Desmidium swartzii from an earlier description by the Swedish clergyman and botanist Carl Adolph Agardh (1785-1859), in Systema algarum (Lund, 1824), p. 9.