Webster’s Revised Unabridged Dictionary · 1913
Desmid
Des′mid, Des·mid′i·an, n. [Gr. δεσμός chain + εἶδος form.] (Bot.) A microscopic plant of the family Desmidiæ, a group of unicellular algæ in which the species have a greenish color, and the cells generally appear as if they consisted of two coalescing halves.