combining form repr. Gr. τύχη fortune, chance, used in a few recent scientific terms. Tychoparthenogenesis, exceptional or occasional parthenogenesis. Tychopotamic a. [Gr. ποταμός river], of occasional occurrence in or near rivers.
1900. B. D. Jackson, Gloss. Bot. Terms, Tychopotamic … Plankton, the floating organisms of pools and river overflows (Zimmer).
1909. Cent. Dict. Suppl., Tychoparthenogenesis.
