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