any of the beautiful, single-celled (sometimes filamentous or colonial), microscopic green algae of the order Zygnematales, class Charophyceae, ... [2 related articles] Found on http://www.britannica.com/eb/a-z/d/36
<botany> Chlorophyte algae that are usually freshwater living and unicellular. Their cell wall often has elaborate ornamented shape. ... (18 Nov 1997) ... Found on http://www.encyclo.co.uk/local/20973
any single-celled freshwater algae of the family Desmidiaceae, characterized by a division of the body into mirror-image halves joined by a bridge containing the nucleus, and having a spiny or bristly exterior: sometimes forming into colonies or branching filaments. Found on https://www.infoplease.com/dictionary/desmid