a. Bot. [f. mod.L. Zygnēmāceæ pl., f. Zygnēma (Kützing, 1843), irreg. for *zygonēma, f. Gr. ζυγόν yoke + νῆμα thread: see -ACEOUS.] Belonging to the N. O. Zygnemaceæ of filamentous fresh-water algæ, typified by the genus Zygnema, which propagate by conjugation. So Zygnemid, a member of this order.
1887. Athenæum, 12 March, 357/1. The Conjugatæ, including zygnemids and desmids.
